A268664 - OEIS

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A268664

Numbers n such that 5*2^n + 1 is a prime factor of a generalized Fermat number 12^(2^m) + 1 for some m.

13, 15, 127, 5947, 26607, 1320487

(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..6.

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, A268661, A268662, A268663, A226366, A268657, A268658, A204620, A268659, A268660. Subsequence of A002254.

Sequence in context: A302001 A109018 A237912 * A158697 A295151 A172975

Adjacent sequences: A268661 A268662 A268663 * A268665 A268666 A268667

KEYWORD

nonn,hard,more

AUTHOR

Arkadiusz Wesolowski, Feb 10 2016

STATUS

approved