A268660 Numbers n such that 3*2^n + 1 is a prime factor of a generalized Fermat number 12^(2^m) + 1 for some m.

2, 5, 8, 41, 209, 353, 2816, 20909, 42665, 157169, 213321, 303093, 362765, 382449, 2145353, 2478785

Offset

1,1

References

Wilfrid Keller, private communication, 2008.

Links

Table of n, a(n) for n=1..16.

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=12)

OEIS Wiki, Generalized Fermat numbers

Crossrefs

Cf. A152585, A268657, A268658, A204620, A268659, A268661, A268662, A268663, A226366, A268664. Subsequence of A002253.

Sequence in context: A120342 A214842 A299517 * A180627 A264860 A061354

Adjacent sequences: A268657 A268658 A268659 * A268661 A268662 A268663

Keyword

nonn,hard,more

Author

Arkadiusz Wesolowski, Feb 10 2016

Status

approved