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 A268662 Numbers n such that 5*2^n + 1 is a prime factor of a generalized Fermat number 5^(2^m) + 1 for some m. 10
 7, 15, 25, 39, 55, 75, 85, 127, 1947, 3313, 13165, 23473, 125413, 1282755, 1777515 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 REFERENCES Wilfrid Keller, private communication, 2008. LINKS Table of n, a(n) for n=1..15. Anders Björn and Hans Riesel, Factors of generalized Fermat numbers, Math. Comp. 67 (1998), no. 221, pp. 441-446. Anders Björn and Hans Riesel, Table errata to “Factors of generalized Fermat numbers”, Math. Comp. 74 (2005), no. 252, p. 2099. Anders Björn and Hans Riesel, Table errata 2 to "Factors of generalized Fermat numbers", Math. Comp. 80 (2011), pp. 1865-1866. C. K. Caldwell, Top Twenty page, Generalized Fermat Divisors (base=5) OEIS Wiki, Generalized Fermat numbers CROSSREFS Cf. A199591, A268661, A268663, A226366, A268664, A268657, A268658, A204620, A268659, A268660. Subsequence of A002254. Sequence in context: A082111 A323483 A236582 * A297954 A298577 A299569 Adjacent sequences: A268659 A268660 A268661 * A268663 A268664 A268665 KEYWORD nonn,hard,more AUTHOR Arkadiusz Wesolowski, Feb 10 2016 STATUS approved

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Last modified December 9 17:15 EST 2023. Contains 367693 sequences. (Running on oeis4.)