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A093625
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Primes of the form (3^m + 1)/2.
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6
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OFFSET
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1,1
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COMMENTS
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Primes can only occur for m=2^k. The next term (if it exists) has k >= 21 (i.e., more than 10^6 decimal digits). - Don Reble, Apr 28 2004. [For the latest results about the search, see A171381. - N. J. A. Sloane, Jun 14 2010]
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LINKS
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Table of n, a(n) for n=1..6.
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EXAMPLE
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a(3)=41 because it can be written as (3^4 + 1)/2 = 82/2.
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CROSSREFS
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A171381 is the main entry for this sequence. Cf. also A059917, A138083.
Sequence in context: A076725 A059917 A255963 * A042447 A176266 A075872
Adjacent sequences: A093622 A093623 A093624 * A093626 A093627 A093628
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KEYWORD
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nonn,hard
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AUTHOR
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Hugo Pfoertner, Apr 19 2004
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EXTENSIONS
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Erroneous terms deleted by N. J. A. Sloane, Jun 14 2010
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STATUS
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approved
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