A268659 Numbers n such that 3*2^n + 1 is a prime factor of a generalized Fermat number 10^(2^m) + 1 for some m.

209, 44685, 157169, 303093, 362765, 916773, 2145353

Offset

1,1

References

Wilfrid Keller, private communication, 2008.

Links

Table of n, a(n) for n=1..7.

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=10)

OEIS Wiki, Generalized Fermat numbers

Crossrefs

Cf. A080176, A268657, A268658, A204620, A268660, A268661, A268662, A268663, A226366, A268664. Subsequence of A002253.

Sequence in context: A029554 A203458 A003779 * A265682 A071379 A283153

Adjacent sequences: A268656 A268657 A268658 * A268660 A268661 A268662

Keyword

nonn,hard,more

Author

Arkadiusz Wesolowski, Feb 10 2016

Status

approved