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A182331
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Primes of the form 6^n + 1.
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9
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OFFSET
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1,1
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COMMENTS
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No other terms for n < 3000. - T. D. Noe, Apr 25 2012
Apart from the first term, the exponents must be powers of two. Like Fermat primes, there are probably only finitely many terms. No more terms for n < 268,435,456. - Charles R Greathouse IV, Jul 16 2012
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LINKS
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Table of n, a(n) for n=1..4.
Wilfrid Keller, Prime factors of generalized Fermat numbers F_m(6) and complete factoring status
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MATHEMATICA
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Select[Table[6^n + 1, {n, 0, 100}], PrimeQ] (* _T. D. Noe, Apr 25 2012 *)
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PROG
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(PFGW) ABC2 6^(2^$a)+1
a: from 0 to 18
// Charles R Greathouse IV, Jul 16 2012
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CROSSREFS
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Cf. A057735, A182330.
Sequence in context: A195068 A342412 A196916 * A173762 A180269 A036432
Adjacent sequences: A182328 A182329 A182330 * A182332 A182333 A182334
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KEYWORD
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nonn
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AUTHOR
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Alex Ratushnyak, Apr 25 2012
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STATUS
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approved
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