Generalized Fermat number (GFN) primes bases 2 thru 1030
to n=4194304 (2^22)
Started: Apr. 2, 2010
Last update: Nov. 29, 2016
Compiled by Gary Barnes
| base | n is prime |
| 2 | 1, 2, 4, 8, 16 |
| 4 | 1, 2, 4, 8 |
| 6 | 1, 2, 4 |
| 8 | (not possible) |
| 10 | 1, 2 |
| 12 | 1 |
| 14 | 2 |
| 16 | 1, 2, 4 |
| 18 | 1 |
| 20 | 2, 4 |
| 22 | 1 |
| 24 | 2, 4 |
| 26 | 2 |
| 28 | 1, 4 |
| 30 | 1, 32 |
| 32 | (not possible) |
| 34 | 4 |
| 36 | 1, 2 |
| 38 | |
| 40 | 1, 2 |
| 42 | 1 |
| 44 | 16 |
| 46 | 1, 4, 512 |
| 48 | 4 |
| 50 | |
| 52 | 1 |
| 54 | 2, 4, 32 |
| 56 | 2, 4 |
| 58 | 1 |
| 60 | 1 |
| 62 | |
| 64 | (not possible) |
| 66 | 1, 2 |
| 68 | |
| 70 | 1 |
| 72 | 1 |
| 74 | 2, 4, 16 |
| 76 | 16 |
| 78 | 1 |
| 80 | 4 |
| 82 | 1, 4 |
| 84 | 2 |
| 86 | |
| 88 | 1, 4 |
| 90 | 2, 4 |
| 92 | |
| 94 | 2, 16 |
| 96 | 1, 32 |
| 98 | |
| 100 | 1 |
| 102 | 1, 64 |
| 104 | |
| 106 | 1, 4 |
| 108 | 1 |
| 110 | 2 |
| 112 | 1, 32 |
| 114 | 32 |
| 116 | 2 |
| 118 | 4, 8 |
| 120 | 2, 128 |
| 122 | |
| 124 | 2 |
| 126 | 1, 2 |
| 128 | (not possible) |
| 130 | 1, 2 |
| 132 | 4, 8, 32 |
| 134 | 2 |
| 136 | 1 |
| 138 | 1 |
| 140 | 4, 8 |
| 142 | 4 |
| 144 | |
| 146 | 2 |
| 148 | 1 |
| 150 | 1, 2, 2048 |
| 152 | 8 |
| 154 | 4 |
| 156 | 1, 2, 16, 32 |
| 158 | 16 |
| 160 | 2, 4 |
| 162 | 1, 64 |
| 164 | 4 |
| 166 | 1 |
| 168 | |
| 170 | 2 |
| 172 | 1 |
| 174 | 4 |
| 176 | 2, 16 |
| 178 | 1 |
| 180 | 1, 2, 4 |
| 182 | |
| 184 | 2 |
| 186 | |
| 188 | 16 |
| 190 | 1, 128 |
| 192 | 1 |
| 194 | 4 |
| 196 | 1 |
| 198 | 1, 4, 16 |
| 200 | |
| 202 | |
| 204 | 2, 4 |
| 206 | 2 |
| 208 | 8 |
| 210 | 1, 2, 4 |
| 212 | |
| 214 | |
| 216 | (not possible) |
| 218 | |
| 220 | 4 |
| 222 | 1 |
| 224 | 2 |
| 226 | 1 |
| 228 | 1, 4 |
| 230 | 2 |
| 232 | 1 |
| 234 | 128 |
| 236 | 2 |
| 238 | 1, 4 |
| 240 | 1, 2, 8 |
| 242 | 4, 8 |
| 244 | |
| 246 | |
| 248 | 4, 16 |
| 250 | 1, 2 |
| 252 | |
| 254 | 4 |
| 256 | 1, 2 |
| 258 | |
| 260 | 2 |
| 262 | 1 |
| 264 | 2 |
| 266 | 4 |
| 268 | 1 |
| 270 | 1, 2 |
| 272 | 4 |
| 274 | 64 |
| 276 | 1, 4 |
| 278 | 4, 256 |
| 280 | 1, 2 |
| 282 | 1 |
| 284 | 2 |
| 286 | |
| 288 | 4, 8, 16 |
| 290 | 8 |
| 292 | 1 |
| 294 | |
| 296 | 4 |
| 298 | |
| 300 | 2, 64 |
| 302 | |
| 304 | |
| 306 | 1, 2, 8, 16 |
| 308 | |
| 310 | 1 |
| 312 | 1, 4 |
| 314 | 2 |
| 316 | 1 |
| 318 | 16 |
| 320 | 4 |
| 322 | |
| 324 | |
| 326 | 2 |
| 328 | 4 |
| 330 | 1, 16 |
| 332 | 32 |
| 334 | 4 |
| 336 | 1 |
| 338 | |
| 340 | 2, 4 |
| 342 | 32 |
| 344 | |
| 346 | 1 |
| 348 | 1, 16 |
| 350 | 2 |
| 352 | 1, 4 |
| 354 | |
| 356 | |
| 358 | 1 |
| 360 | 32 |
| 362 | |
| 364 | 4 |
| 366 | 1 |
| 368 | |
| 370 | 16 |
| 372 | 1 |
| 374 | 4 |
| 376 | 32 |
| 378 | 1, 8 |
| 380 | |
| 382 | 1, 16 |
| 384 | 2 |
| 386 | 2 |
| 388 | 1 |
| 390 | |
| 392 | 8 |
| 394 | |
| 396 | 1, 2, 16 |
| 398 | |
| 400 | 1, 2 |
| 402 | |
| 404 | |
| 406 | 2 |
| 408 | 1 |
| 410 | |
| 412 | 64 |
| 414 | 4 |
| 416 | |
| 418 | 1 |
| 420 | 1, 2 |
| 422 | |
| 424 | |
| 426 | 8 |
| 428 | 32 |
| 430 | 1, 2, 4, 32 |
| 432 | 1, 32 |
| 434 | 8 |
| 436 | 2, 4 |
| 438 | 1 |
| 440 | 2 |
| 442 | 1, 4, 8 |
| 444 | 2 |
| 446 | |
| 448 | 1, 32 |
| 450 | |
| 452 | 16 |
| 454 | |
| 456 | 1, 16 |
| 458 | |
| 460 | 1 |
| 462 | 1 |
| 464 | 2 |
| 466 | 1, 2, 4 |
| 468 | |
| 470 | 2, 16 |
| 472 | 4 |
| 474 | 2, 16 |
| 476 | 4, 16 |
| 478 | 1, 16 |
| 480 | |
| 482 | |
| 484 | |
| 486 | 1 |
| 488 | 4 |
| 490 | 1, 2 |
| 492 | 4 |
| 494 | 4 |
| 496 | 2 |
| 498 | 1, 4 |
| 500 | |
| 502 | 1 |
| 504 | 4 |
| 506 | 128 |
| 508 | 1, 8 |
| 510 | 8 |
| 512 | (not possible) |
| 514 | |
| 516 | 4 |
| 518 | |
| 520 | 1 |
| 522 | 1 |
| 524 | |
| 526 | 4 |
| 528 | |
| 530 | |
| 532 | 128 |
| 534 | |
| 536 | 2 |
| 538 | |
| 540 | 1, 4, 8 |
| 542 | 8 |
| 544 | 2 |
| 546 | 1 |
| 548 | 128 |
| 550 | 4 |
| 552 | |
| 554 | 4 |
| 556 | 1, 2, 4 |
| 558 | |
| 560 | 16 |
| 562 | 1, 8, 32, 64 |
| 564 | |
| 566 | 4 |
| 568 | 1, 4, 16 |
| 570 | 1, 2 |
| 572 | |
| 574 | |
| 576 | 1, 2 |
| 578 | |
| 580 | |
| 582 | 4 |
| 584 | 2, 4 |
| 586 | 1 |
| 588 | 32 |
| 590 | |
| 592 | 1, 64 |
| 594 | 2 |
| 596 | 8 |
| 598 | 1, 16 |
| 600 | 1, 4 |
| 602 | |
| 604 | |
| 606 | 1 |
| 608 | |
| 610 | 8 |
| 612 | 1 |
| 614 | 256 |
| 616 | 1, 4 |
| 618 | 1 |
| 620 | |
| 622 | |
| 624 | 4 |
| 626 | |
| 628 | 4 |
| 630 | 1 |
| 632 | |
| 634 | 2 |
| 636 | 2 |
| 638 | |
| 640 | 1 |
| 642 | 1, 16 |
| 644 | 2 |
| 646 | 1, 2 |
| 648 | |
| 650 | |
| 652 | 1 |
| 654 | 2 |
| 656 | 4 |
| 658 | 1 |
| 660 | 1 |
| 662 | |
| 664 | 8 |
| 666 | |
| 668 | |
| 670 | |
| 672 | 1 |
| 674 | 2 |
| 676 | 1 |
| 678 | |
| 680 | 2, 8 |
| 682 | 1, 8 |
| 684 | |
| 686 | 2, 16 |
| 688 | 16 |
| 690 | 1, 2, 4, 16 |
| 692 | |
| 694 | |
| 696 | 2 |
| 698 | |
| 700 | 1, 2 |
| 702 | 4 |
| 704 | 2 |
| 706 | |
| 708 | 1 |
| 710 | 4 |
| 712 | |
| 714 | 2 |
| 716 | 2 |
| 718 | 1 |
| 720 | |
| 722 | |
| 724 | |
| 726 | 1, 32 |
| 728 | 64 |
| 730 | 4 |
| 732 | 1, 4, 8 |
| 734 | |
| 736 | 16 |
| 738 | 1, 4, 32 |
| 740 | 2 |
| 742 | 1, 4 |
| 744 | |
| 746 | |
| 748 | 4 |
| 750 | 1, 2 |
| 752 | |
| 754 | |
| 756 | 1 |
| 758 | 4 |
| 760 | 1, 2, 4 |
| 762 | |
| 764 | 2 |
| 766 | |
| 768 | 1, 4 |
| 770 | |
| 772 | 1, 4 |
| 774 | 16 |
| 776 | 16 |
| 778 | 4, 16 |
| 780 | 2 |
| 782 | 8 |
| 784 | 2 |
| 786 | 1, 4 |
| 788 | 4 |
| 790 | 16 |
| 792 | |
| 794 | |
| 796 | 1 |
| 798 | 4 |
| 800 | 4, 8 |
| 802 | |
| 804 | 32 |
| 806 | |
| 808 | 1, 8 |
| 810 | 1, 4 |
| 812 | |
| 814 | |
| 816 | 2 |
| 818 | |
| 820 | 1 |
| 822 | 1 |
| 824 | 1024 |
| 826 | 1, 2 |
| 828 | 1 |
| 830 | 16 |
| 832 | 16 |
| 834 | 16 |
| 836 | |
| 838 | 1 |
| 840 | |
| 842 | |
| 844 | |
| 846 | 16 |
| 848 | |
| 850 | 32 |
| 852 | 1 |
| 854 | |
| 856 | 1, 4 |
| 858 | 1 |
| 860 | 2 |
| 862 | 1 |
| 864 | 2 |
| 866 | 8 |
| 868 | |
| 870 | |
| 872 | |
| 874 | 4 |
| 876 | 1, 8 |
| 878 | |
| 880 | 1 |
| 882 | 1 |
| 884 | 8, 32 |
| 886 | 1 |
| 888 | |
| 890 | 2 |
| 892 | 8, 256 |
| 894 | 4 |
| 896 | |
| 898 | 256 |
| 900 | 16 |
| 902 | |
| 904 | |
| 906 | 1, 2 |
| 908 | |
| 910 | 1, 2 |
| 912 | 4 |
| 914 | 4 |
| 916 | 8, 16 |
| 918 | 1, 8 |
| 920 | 2 |
| 922 | |
| 924 | |
| 926 | |
| 928 | 1, 4 |
| 930 | 2, 4 |
| 932 | |
| 934 | 8 |
| 936 | 1, 2, 4 |
| 938 | |
| 940 | 1 |
| 942 | |
| 944 | |
| 946 | 1, 2, 16 |
| 948 | |
| 950 | 2 |
| 952 | 1, 4 |
| 954 | |
| 956 | 8, 16 |
| 958 | |
| 960 | 2, 128 |
| 962 | 4 |
| 964 | |
| 966 | 1, 2, 4 |
| 968 | |
| 970 | 1 |
| 972 | 16 |
| 974 | |
| 976 | 1 |
| 978 | |
| 980 | |
| 982 | 1, 16 |
| 984 | 16 |
| 986 | 2, 4 |
| 988 | |
| 990 | 1, 8 |
| 992 | 4 |
| 994 | |
| 996 | 1, 4 |
| 998 | |
| 1000 | (not possible) |
| 1002 | |
| 1004 | 2 |
| 1006 | |
| 1008 | 1 |
| 1010 | 2 |
| 1012 | 1 |
| 1014 | |
| 1016 | |
| 1018 | 1, 16 |
| 1020 | 1 |
| 1022 | 8 |
| 1024 | (not possible) |
| 1026 | |
| 1028 | 8 |
| 1030 | 1 |