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A268663 Numbers n such that 5*2^n + 1 is a prime factor of a generalized Fermat number 6^(2^m) + 1 for some m. 10
127, 4687, 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..3.

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=6)

OEIS Wiki, Generalized Fermat numbers

CROSSREFS

Cf. A078303, A268661, A268662, A226366, A268664, A268657, A268658, A204620, A268659, A268660. Subsequence of A002254.

Sequence in context: A176357 A201071 A137789 * A005464 A160898 A140477

Adjacent sequences:  A268660 A268661 A268662 * A268664 A268665 A268666

KEYWORD

nonn,bref,hard,more

AUTHOR

Arkadiusz Wesolowski, Feb 10 2016

STATUS

approved

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Last modified July 22 02:02 EDT 2019. Contains 325210 sequences. (Running on oeis4.)