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Palindromic Merlon Primes (PMP's)
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121	141	151	171	181
313	323	343	353	373
383	717	727	747	757
787	919	929	949	959
979	989

Palindromic Merlon Primes (or PMP's for short) are numbers that
are (probable) primes, palindromic in base 10, and consisting of one central digit
(hereby named as a merlon_digit) surrounded by two symmetrical crennelations
with same digits different from the central merlon_digit and finally bordered left
and right by that same central merlon_digit. E.g.

3223223 31111111111111111311111111111111113

From these examples you will understand the naming of these kind of palindromic primes Visualising merlons

Some links where PMP's are discussed ¬

Liczby pierwsze o szczególnym rozmieszczeniu cyfr by Andrzej Nowicki

    Translated in Dutch “Priemgetallen met een speciale rangschikking van cijfers”

    Translated in English “Prime numbers with a special arrangement of digits”

1221221 from the site 'Darkbyte'

3223223 from Prime Curios!

In case one should discover more sources I will be most happy
to add them to the list. Just let me know.

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PMP's sorted by length

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Some combinations can never produce primes since
these are always divisible by 3.

1(0)_w1(0)_w1

1(3)_w1(3)_w1

1(6)_w1(6)_w1

1(9)_w1(9)_w1

3(0)_w3(0)_w3

3(6)_w3(6)_w3

3(9)_w3(9)_w3

7(0)_w7(0)_w7

7(3)_w7(3)_w7

7(6)_w7(6)_w7

7(9)_w7(9)_w7

9(0)_w9(0)_w9

9(3)_w9(3)_w9

9(6)_w9(6)_w9

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PMP Factorization Projects

( n = 2 * w + 3 )

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PMP (Palindromic Merlon Primes) reference files (under construction)
1(2)w1(2)w1 = 2*(10n–1)/9 – 10n-1 – 10(n-1)/2 – 1	facpmp121.htm (maintained by Patrick De Geest)
1(4)w1(4)w1 = 4*(10n–1)/9 – 3*10n-1 – 3*10(n-1)/2 – 3	facpmp141.htm (maintained by Patrick De Geest)
1(5)w1(5)w1 = 5*(10n–1)/9 – 4*10n-1 – 4*10(n-1)/2 – 4	facpmp151.htm (maintained by Patrick De Geest)
1(7)w1(7)w1 = 7*(10n–1)/9 – 6*10n-1 – 6*10(n-1)/2 – 6	facpmp171.htm (maintained by Patrick De Geest)
1(8)w1(8)w1 = 8*(10n–1)/9 – 7*10n-1 – 7*10(n-1)/2 – 7	facpmp181.htm (maintained by Patrick De Geest)
3(1)w3(1)w3 = 3*(10n–1)/9 + 2*10n-1 + 2*10(n-1)/2 + 2	facpmp313.htm (maintained by Patrick De Geest)
3(2)w3(2)w3 = 2*(10n–1)/9 + 10n-1 + 10(n-1)/2 + 1	facpmp323.htm (maintained by Patrick De Geest)
3(4)w3(4)w3 = 4*(10n–1)/9 – 10n-1 – 10(n-1)/2 – 1	facpmp343.htm (maintained by Patrick De Geest)
3(5)w3(5)w3 = 5*(10n–1)/9 – 2*10n-1 – 2*10(n-1)/2 – 2	facpmp353.htm (maintained by Patrick De Geest)
3(7)w3(7)w3 = 7*(10n–1)/9 – 4*10n-1 – 4*10(n-1)/2 – 4	facpmp373.htm (maintained by Patrick De Geest)

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The reference table for Palindromic Merlon Primes
This collection is complete for probable primes up to 50000 digits and for proven primes up to  ????  digits.		PDG = Patrick De Geest
PMP	Formula blue exp = # of digits	Who	When	Status	Output Logs
¬	n ⩾ 50011 (PDG, September 27, 2022)
1(2)21(2)21	2*(10{7}–1)/9 – 106 – 103 – 1	PDG	Nov 12 2011	PRIME	View
1(2)41(2)41	2*(10{11}–1)/9 – 1010 – 105 – 1	PDG	Nov 12 2011	PRIME	View
1(2)111(2)111	2*(1025–1)/9 – 1024 – 1012 – 1	PDG	Nov 12 2011	PRIME	View
1(2)23921(2)23921	2*(10{4787}–1)/9 – 104786 – 102393 – 1	PDG	Nov 12 2011	PROBABLE PRIME	View
1(2)188141(2)188141	2*(1037631–1)/9 – 1037630 – 1018815 – 1	PDG	Sep 27 2022	PROBABLE PRIME	View
¬	n ⩾ 50191 (PDG, September 28, 2022)
1(4)441(4)441	4*(1091–1)/9 – 3*1090 – 3*1045 – 3	PDG	Nov 12 2011	PRIME	View
1(4)641(4)641	4*(10{131}–1)/9 – 3*10130 – 3*1065 – 3	PDG	Nov 12 2011	PRIME	View
1(4)91491(4)91491	4*(10{18301}–1)/9 – 3*1018300 – 3*109150 – 3	PDG	Nov 12 2011	PROBABLE PRIME	View
1(4)228261(4)228261	4*(1045655–1)/9 – 3*1045654 – 3*1022827 – 3	PDG	Sep 28 2022	PROBABLE PRIME	View
¬	n ⩾ 53947 (PDG, September 28, 2022)
1(5)21(5)21	5*(10{7}–1)/9 – 4*106 – 4*103 – 4	PDG	Nov 12 2011	PRIME	View
1(5)81(5)81	5*(10{19}–1)/9 – 4*1018 – 4*109 – 4	PDG	Nov 12 2011	PRIME	View
1(5)321(5)321	5*(10{67}–1)/9 – 4*1066 – 4*1033 – 4	PDG	Nov 12 2011	PRIME	View
1(5)1281(5)1281	5*(10259–1)/9 – 4*10258 – 4*10129 – 4	PDG	Nov 12 2011	PRIME	View
1(5)4941(5)4941	5*(10{991}–1)/9 – 4*10990 – 4*10495 – 4	PDG	Nov 12 2011	PRIME	View
1(5)42611(5)42611	5*(108525–1)/9 – 4*108524 – 4*104262 – 4	PDG	Nov 12 2011	PROBABLE PRIME	View
1(5)137651(5)137651	5*(1027533–1)/9 – 4*1027532 – 4*1013766 – 4	PDG	Sep 28 2022	PROBABLE PRIME	View
¬	n ⩾ 56095 (PDG, September 29, 2022)
1(7)41(7)41	7*(10{11}–1)/9 – 6*1010 – 6*105 – 6	PDG	Nov 12 2011	PRIME	View
1(7)221(7)221	7*(10{47}–1)/9 – 6*1046 – 6*1023 – 6	PDG	Nov 12 2011	PRIME	View
1(7)3161(7)3161	7*(10635–1)/9 – 6*10634 – 6*10317 – 6	PDG	Nov 12 2011	PRIME	View
1(7)4421(7)4421	7*(10{887}–1)/9 – 6*10886 – 6*10443 – 6	PDG	Nov 12 2011	PRIME	View
¬	n ⩾ 58103 (PDG, September 29, 2022)
1(8)11(8)11	8*(10{5}–1)/9 – 7*104 – 7*102 – 7	PDG	Nov 12 2011	PRIME	View
1(8)21(8)21	8*(10{7}–1)/9 – 7*106 – 7*103 – 7	PDG	Nov 12 2011	PRIME	View
1(8)1451(8)1451	8*(10{293}–1)/9 – 7*10292 – 7*10146 – 7	PDG	Nov 12 2011	PRIME	View
1(8)2541(8)2541	8*(10511–1)/9 – 7*10510 – 7*10255 – 7	PDG	Nov 12 2011	PRIME	View
1(8)16271(8)16271	8*(10{3257}–1)/9 – 7*103256 – 7*101628 – 7	PDG	Nov 12 2011	PROBABLE PRIME	View
1(8)18131(8)18131	8*(103629–1)/9 – 7*103628 – 7*101814 – 7	PDG	Nov 12 2011	PROBABLE PRIME	View
¬	n ⩾ 53315 (PDG, September 30, 2022)
3(1)163(1)163	(1035–1)/9 + 2*1034 + 2*1017 + 2	PDG	Nov 12 2011	PRIME	View
3(1)433(1)433	(10{89}–1)/9 + 2*1088 + 2*1044 + 2	PDG	Nov 12 2011	PRIME	View
3(1)863(1)863	(10175–1)/9 + 2*10174 + 2*1087 + 2	PDG	Nov 12 2011	PRIME	View
3(1)11533(1)11533	(10{2309}–1)/9 + 2*102308 + 2*101154 + 2	PDG	Nov 12 2011	PRIME	View
¬	n ⩾ 50821 (PDG, October 1, 2022)
3(2)13(2)13	2*(10{5}–1)/9 + 104 + 102 + 1	PDG	Nov 12 2011	PRIME	View
3(2)23(2)23	2*(10{7}–1)/9 + 106 + 103 + 1	PDG	Nov 12 2011	PRIME	View
3(2)53(2)53	2*(10{13}–1)/9 + 1012 + 106 + 1	PDG	Nov 12 2011	PRIME	View
3(2)19033(2)19033	2*(10{3809}–1)/9 + 103808 + 101904 + 1	PDG	Nov 12 2011	PROBABLE PRIME	View
3(2)29533(2)29533	2*(105909–1)/9 + 105908 + 102954 + 1	PDG	Nov 12 2011	PROBABLE PRIME	View
3(2)34133(2)34133	2*(10{6829}–1)/9 + 106828 + 103414 + 1	PDG	Nov 12 2011	PROBABLE PRIME	View
¬	n ⩾ 50189 (PDG, October 2, 2022)
3(4)23(4)23	4*(10{7}–1)/9 – 106 – 103 – 1	PDG	Dec 27 2012	PRIME	View
3(4)43(4)43	4*(10{11}–1)/9 – 1010 – 105 – 1	PDG	Nov 12 2011	PRIME	View
3(4)73(4)73	4*(10{17}–1)/9 – 1016 – 108 – 1	PDG	Nov 12 2011	PRIME	View
3(4)223(4)223	4*(10{47}–1)/9 – 1046 – 1023 – 1	PDG	Nov 12 2011	PRIME	View
3(4)263(4)263	4*(1055–1)/9 – 1054 – 1027 – 1	PDG	Nov 12 2011	PRIME	View
3(4)1823(4)1823	4*(10{367}–1)/9 – 10366 – 10183 – 1	PDG	Nov 12 2011	PRIME	View
3(4)2053(4)2053	4*(10413–1)/9 – 10412 – 10206 – 1	PDG	Nov 12 2011	PRIME	View
3(4)4763(4)4763	4*(10955–1)/9 – 10954 – 10477 – 1	PDG	Nov 12 2011	PRIME	View
3(4)13193(4)13193	4*(102641–1)/9 – 102640 – 101320 – 1	PDG	Nov 12 2011	PROBABLE PRIME	View
3(4)127423(4)127423	4*(1025487–1)/9 – 1025486 – 1012743 – 1	PDG	Oct 1 2022	PROBABLE PRIME	View
3(4)172433(4)172433	4*(1034489–1)/9 – 1034488 – 1017244 – 1	PDG	Oct 1 2022	PROBABLE PRIME	View
¬	n ⩾ 50657 (PDG, October 2, 2022)
3(5)13(5)13	5*(10{5}–1)/9 – 2*104 – 2*102 – 2	PDG	Nov 12 2011	PRIME	View
3(5)23(5)23	5*(10{7}–1)/9 – 2*106 – 2*103 – 2	PDG	Nov 12 2011	PRIME	View
3(5)173(5)173	5*(10{37}–1)/9 – 2*1036 – 2*1018 – 2	PDG	Nov 12 2011	PRIME	View
3(5)203(5)203	5*(10{43}–1)/9 – 2*1042 – 2*1021 – 2	PDG	Nov 12 2011	PRIME	View
3(5)263(5)263	5*(1055–1)/9 – 2*1054 – 2*1027 – 2	PDG	Nov 12 2011	PRIME	View
3(5)1573(5)1573	5*(10{317}–1)/9 – 2*10316 – 2*10158 – 2	PDG	Nov 12 2011	PRIME	View
3(5)6143(5)6143	5*(10{1231}–1)/9 – 2*101230 – 2*10615 – 2	PDG	Nov 12 2011	PROBABLE PRIME	View
3(5)8333(5)8333	5*(10{1669}–1)/9 – 2*101668 – 2*10834 – 2	PDG	Nov 12 2011	PROBABLE PRIME	View
3(5)33613(5)33613	5*(106725–1)/9 – 2*106724 – 2*103362 – 2	PDG	Nov 12 2011	PROBABLE PRIME	View
3(5)36313(5)36313	5*(107265–1)/9 – 2*107264 – 2*103632 – 2	PDG	Nov 12 2011	PROBABLE PRIME	View
3(5)38443(5)38443	5*(10{7691}–1)/9 – 2*107690 – 2*103845 – 2	PDG	Nov 12 2011	PROBABLE PRIME	View
¬	n ⩾ 55429 (PDG, October 3, 2022)
3(7)23(7)23	7*(10{7}–1)/9 – 4*106 – 4*103 – 4	PDG	Nov 12 2011	PRIME	View
3(7)43(7)43	7*(10{11}–1)/9 – 4*1010 – 4*105 – 4	PDG	Nov 12 2011	PRIME	View
3(7)473(7)473	7*(10{97}–1)/9 – 4*1096 – 4*1048 – 4	PDG	Nov 12 2011	PRIME	View
3(7)593(7)593	7*(10121–1)/9 – 4*10120 – 4*1060 – 4	PDG	Nov 12 2011	PRIME	View
3(7)703(7)703	7*(10143–1)/9 – 4*10142 – 4*1071 – 4	PDG	Nov 12 2011	PRIME	View
3(7)1223(7)1223	7*(10247–1)/9 – 4*10246 – 4*10123 – 4	PDG	Nov 12 2011	PRIME	View
3(7)1283(7)1283	7*(10259–1)/9 – 4*10258 – 4*10129 – 4	PDG	Nov 12 2011	PRIME	View
3(7)56443(7)56443	7*(1012191–1)/9 – 4*1012190 – 4*105645 – 4	PDG	Dec 4 2011	PROBABLE PRIME	View
3(7)85243(7)85243	7*(1017051–1)/9 – 4*1017050 – 4*108525 – 4	PDG	Dec 4 2011	PROBABLE PRIME	View
3(7)189893(7)189893	7*(1037981–1)/9 – 4*1037980 – 4*1018990 – 4	PDG	Oct 3 2022	PROBABLE PRIME	View
¬	n ⩾ 50417 (PDG, October 4, 2022)
3(8)83(8)83	8*(10{19}–1)/9 – 5*1018 – 5*109 – 5	PDG	Nov 12 2011	PRIME	View
3(8)103(8)103	8*(10{23}–1)/9 – 5*1022 – 5*1011 – 5	PDG	Nov 12 2011	PRIME	View
3(8)143(8)143	8*(10{31}–1)/9 – 5*1030 – 5*1015 – 5	PDG	Nov 12 2011	PRIME	View
3(8)673(8)673	8*(10{137}–1)/9 – 5*10136 – 5*1068 – 5	PDG	Nov 12 2011	PRIME	View
3(8)3643(8)3643	8*(10731–1)/9 – 5*10730 – 5*10365 – 5	PDG	Nov 12 2011	PRIME	View
3(8)5783(8)5783	8*(101159–1)/9 – 5*101158 – 5*10579 – 5	PDG	Nov 12 2011	PRIME	View
3(8)8483(8)8483	8*(10{1699}–1)/9 – 5*101698 – 5*10849 – 5	PDG	Nov 12 2011	PROBABLE PRIME	View
3(8)30763(8)30763	8*(106155–1)/9 – 5*106154 – 5*103077 – 5	PDG	Nov 12 2011	PROBABLE PRIME	View
3(8)78403(8)78403	8*(10{15683}–1)/9 – 5*1015682 – 5*107841 – 5	PDG	Dec 5 2011	PROBABLE PRIME	View
3(8)142063(8)142063	8*(1028415–1)/9 – 5*1028414 – 5*1014207 – 5	PDG	Oct 3 2022	PROBABLE PRIME	View
3(8)193993(8)193993	8*(1038801–1)/9 – 5*1038800 – 5*1019400 – 5	PDG	Oct 4 2022	PROBABLE PRIME	View
3(8)233963(8)233963	8*(1046795–1)/9 – 5*1046794 – 5*1023397 – 5	PDG	Oct 4 2022	PROBABLE PRIME	View
¬	n ⩾ 50681 (PDG, October 4, 2022)
7(1)557(1)557	(10{113}–1)/9 + 6*10112 + 6*1056 + 6	PDG	Nov 12 2011	PRIME	View
¬	n ⩾ 51193 (PDG, October 5, 2022)
7(2)17(2)17	2*(10{5}–1)/9 + 5*104 + 5*102 + 5	PDG	Nov 12 2011	PRIME	View
7(2)47(2)47	2*(10{11}–1)/9 + 5*1010 + 5*105 + 5	PDG	Nov 12 2011	PRIME	View
7(2)77(2)77	2*(10{17}–1)/9 + 5*1016 + 5*108 + 5	PDG	Nov 12 2011	PRIME	View
7(2)227(2)227	2*(10{47}–1)/9 + 5*1046 + 5*1023 + 5	PDG	Nov 12 2011	PRIME	View
7(2)297(2)297	2*(10{61}–1)/9 + 5*1060 + 5*1030 + 5	PDG	Nov 12 2011	PRIME	View
7(2)497(2)497	2*(10{101}–1)/9 + 5*10100 + 5*1050 + 5	PDG	Nov 12 2011	PRIME	View
7(2)737(2)737	2*(10{149}–1)/9 + 5*10148 + 5*1074 + 5	PDG	Nov 12 2011	PRIME	View
7(2)837(2)837	2*(10169–1)/9 + 5*10168 + 5*1084 + 5	PDG	Nov 12 2011	PRIME	View
7(2)1187(2)1187	2*(10{239}–1)/9 + 5*10238 + 5*10119 + 5	PDG	Nov 12 2011	PRIME	View
7(2)2417(2)2417	2*(10485–1)/9 + 5*10484 + 5*10242 + 5	PDG	Nov 12 2011	PRIME	View
¬	n ⩾ 51035 (PDG, October 5, 2022)
7(4)17(4)17	4*(10{5}–1)/9 + 3*104 + 3*102 + 3	PDG	Nov 12 2011	PRIME	View
7(4)1217(4)1217	4*(10245–1)/9 + 3*10244 + 3*10122 + 3	PDG	Nov 12 2011	PRIME	View
7(4)5207(4)5207	4*(101043–1)/9 + 3*101042 + 3*10521 + 3	PDG	Nov 12 2011	PROBABLE PRIME	View
7(4)12647(4)12647	4*(10{2531}–1)/9 + 3*102530 + 3*101265 + 3	PDG	Nov 12 2011	PROBABLE PRIME	View
7(4)17807(4)17807	4*(103563–1)/9 + 3*103562 + 3*101781 + 3	PDG	Nov 12 2011	PROBABLE PRIME	View
¬	n ⩾ 56255 (PDG, October 5, 2022)
7(5)262727(5)262727	5*(1052547–1)/9 + 2*1052546 + 2*1026273 + 2	PDG	Nov 12 2011	PROBABLE PRIME	View
¬	n ⩾ 53665 (PDG, October 6, 2022)
7(8)17(8)17	8*(10{5}–1)/9 – 104 – 102 – 1	PDG	Nov 12 2011	PRIME	View
7(8)47(8)47	8*(10{11}–1)/9 – 1010 – 105 – 1	PDG	Nov 12 2011	PRIME	View
7(8)1277(8)1277	8*(10{257}–1)/9 – 10256 – 10128 – 1	PDG	Nov 12 2011	PRIME	View
7(8)3297(8)3297	8*(10{661}–1)/9 – 10660 – 10330 – 1	PDG	Nov 12 2011	PRIME	View
7(8)8037(8)8037	8*(10{1609}–1)/9 – 101608 – 10804 – 1	PDG	Nov 12 2011	PROBABLE PRIME	View
7(8)18407(8)18407	8*(103683–1)/9 – 103682 – 101841 – 1	PDG	Nov 12 2011	PROBABLE PRIME	View
¬	n ⩾ 50395 (PDG, October 7, 2022)
9(1)49(1)49	(10{11}–1)/9 + 8*1010 + 8*105 + 8	PDG	Nov 12 2011	PRIME	View
9(1)79(1)79	(10{17}–1)/9 + 8*1016 + 8*108 + 8	PDG	Nov 12 2011	PRIME	View
9(1)299(1)299	(10{61}–1)/9 + 8*1060 + 8*1030 + 8	PDG	Nov 12 2011	PRIME	View
9(1)469(1)469	(1095–1)/9 + 8*1094 + 8*1047 + 8	PDG	Nov 12 2011	PRIME	View
9(1)589(1)589	(10119–1)/9 + 8*10118 + 8*1059 + 8	PDG	Nov 12 2011	PRIME	View
9(1)689(1)689	(10{139}–1)/9 + 8*10138 + 8*1069 + 8	PDG	Nov 12 2011	PRIME	View
9(1)839(1)839	(10169–1)/9 + 8*10168 + 8*1084 + 8	PDG	Nov 12 2011	PRIME	View
9(1)9559(1)9559	(10{1913}–1)/9 + 8*101912 + 8*10956 + 8	PDG	Nov 12 2011	PROBABLE PRIME	View
9(1)11609(1)11609	(102323–1)/9 + 8*102322 + 8*101161 + 8	PDG	Nov 12 2011	PROBABLE PRIME	View
9(1)55049(1)55049	(10{11011}–1)/9 + 8*1011010 + 8*105505 + 8	PDG	Nov 12 2011	PROBABLE PRIME	View
9(1)62689(1)62689	(10{12539}–1)/9 + 8*1012538 + 8*106269 + 8	PDG	Nov 12 2011	PROBABLE PRIME	View
9(1)92909(1)92909	(10{18583}–1)/9 + 8*1018582 + 8*109291 + 8	PDG	Nov 12 2011	PROBABLE PRIME	View
9(1)217669(1)217669	(1043535–1)/9 + 8*1043534 + 8*1021767 + 8	PDG	Oct 6 2022	PROBABLE PRIME	View
¬	n ⩾ 52841 (PDG, October 7, 2022)
9(2)49(2)49	2*(10{11}–1)/9 + 7*1010 + 7*105 + 7	PDG	Nov 12 2011	PRIME	View
9(2)89(2)89	2*(10{19}–1)/9 + 7*1018 + 7*109 + 7	PDG	Nov 12 2011	PRIME	View
9(2)269(2)269	2*(1055–1)/9 + 7*1054 + 7*1027 + 7	PDG	Nov 12 2011	PRIME	View
9(2)2029(2)2029	2*(10407–1)/9 + 7*10406 + 7*10203 + 7	PDG	Nov 12 2011	PRIME	View
9(2)20689(2)20689	2*(10{4139}–1)/9 + 7*104138 + 7*102069 + 7	PDG	Nov 12 2011	PROBABLE PRIME	View
9(2)63749(2)63749	2*(1012751–1)/9 + 7*1012750 + 7*106375 + 7	PDG	Nov 12 2011	PROBABLE PRIME	View
¬	n ⩾ 50963 (PDG, October 8, 2022)
9(4)19(4)19	4*(10{5}–1)/9 + 5*104 + 5*102 + 5	PDG	Nov 12 2011	PRIME	View
9(4)49(4)49	4*(10{11}–1)/9 + 5*1010 + 5*105 + 5	PDG	Nov 12 2011	PRIME	View
9(4)79(4)79	4*(10{17}–1)/9 + 5*1016 + 5*108 + 5	PDG	Nov 12 2011	PRIME	View
9(4)209(4)209	4*(10{43}–1)/9 + 5*1042 + 5*1021 + 5	PDG	Nov 12 2011	PRIME	View
9(4)5099(4)5099	4*(10{1021}–1)/9 + 5*101020 + 5*10510 + 5	PDG	Nov 12 2011	PROBABLE PRIME	View
¬	n ⩾ 50461 (PDG, October 8, 2022)
9(5)19(5)19	5*(10{5}–1)/9 + 4*104 + 4*102 + 4	PDG	Nov 12 2011	PRIME	View
9(5)389(5)389	5*(10{79}–1)/9 + 4*1078 + 4*1039 + 4	PDG	Nov 12 2011	PRIME	View
9(5)1739(5)1739	5*(10{349}–1)/9 + 4*10348 + 4*10174 + 4	PDG	Nov 12 2011	PRIME	View
9(5)14939(5)14939	5*(102989–1)/9 + 4*102988 + 4*101494 + 4	PDG	Nov 12 2011	PROBABLE PRIME	View
9(5)229909(5)229919	5*(1045983–1)/9 + 4*1045982 + 4*1022991 + 4	PDG	Oct 8 2022	PROBABLE PRIME	View
¬	n ⩾ 56783 (PDG, October 8, 2022)
9(7)29(7)29	7*(10{7}–1)/9 + 2*106 + 2*103 + 2	PDG	Nov 12 2011	PRIME	View
9(7)409(7)409	7*(10{83}–1)/9 + 2*1082 + 2*1041 + 2	PDG	Nov 12 2011	PRIME	View
9(7)2989(7)2989	7*(10{599}–1)/9 + 2*10598 + 2*10299 + 2	PDG	Nov 12 2011	PRIME	View
¬	n ⩾ 52507 (PDG, October 9, 2022)
9(8)29(8)29	8*(10{7}–1)/9 + 106 + 103 + 1	PDG	Nov 12 2011	PRIME	View
9(8)49(8)49	8*(10{11}–1)/9 + 1010 + 105 + 1	PDG	Nov 12 2011	PRIME	View
9(8)149(8)149	8*(10{31}–1)/9 + 1030 + 1015 + 1	PDG	Nov 12 2011	PRIME	View
9(8)329(8)329	8*(10{67}–1)/9 + 1066 + 1033 + 1	PDG	Nov 12 2011	PRIME	View
9(8)569(8)569	8*(10115–1)/9 + 10114 + 1057 + 1	PDG	Nov 12 2011	PRIME	View
9(8)3829(8)3829	8*(10767–1)/9 + 10766 + 10383 + 1	PDG	Nov 12 2011	PRIME	View

Neil Sloane's “Integer Sequences” Encyclopedia can be consulted online : Neil Sloane's Integer Sequences Various numbers, primes and palindromic primes are categorised as follows : %N Merlon numbers. Start is identical to sequence A?????? %N Palindromic merlon primes. under A?????? %N Palindromic merlon primes exist for digitlengths a(n). under A?????? Click here to view some of the author's [P. De Geest] entries to the table. Click here to view some entries to the table about palindromes.

Prime Curios! - site maintained by G. L. Honaker Jr. and Chris Caldwell

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All probable primes above 10000 digits are also
submitted to the PRP TOP records table maintained by Henri & Renaud Lifchitz.
See : http://www.primenumbers.net/prptop/prptop.php

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( © All rights reserved ) - Last modified : January 8, 2023.

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Patrick De Geest - Belgium - Short Bio - Some Pictures
E-mail address : pdg@worldofnumbers.com

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