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A258091 Smallest prime factor of 1+78557*2^n, cf. A258073. 4
5, 3, 73, 3, 5, 3, 7, 3, 5, 3, 13, 3, 5, 3, 19, 3, 5, 3, 7, 3, 5, 3, 13, 3, 5, 3, 37, 3, 5, 3, 7, 3, 5, 3, 13, 3, 5, 3, 71, 3, 5, 3, 7, 3, 5, 3, 13, 3, 5, 3, 19, 3, 5, 3, 7, 3, 5, 3, 13, 3, 5, 3, 37, 3, 5, 3, 7, 3, 5, 3, 13, 3, 5, 3, 73, 3, 5, 3, 7, 3, 5, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n) = A020639(A258073(a(n)));

a(n) <= 73; see also A258095.

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Wikipedia, Sierpinski Number

PROG

(Haskell)

a258091 = a020639 . a258073

CROSSREFS

Cf. A020639, A258073, A258095.

Sequence in context: A007299 A257935 A109254 * A255599 A145985 A180403

Adjacent sequences:  A258088 A258089 A258090 * A258092 A258093 A258094

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, May 19 2015

STATUS

approved

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Last modified May 22 21:17 EDT 2019. Contains 323504 sequences. (Running on oeis4.)