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A251057 Odd numbers n not congruent to 5 mod 6 such that for all k >= 1 the numbers n*4^k + 1 are composite. 2
66741, 271129, 308481, 327739, 436029, 482719, 575041, 636921, 934909, 965431, 1259541, 1259779, 1384059, 1518781, 1639459, 1997589, 2038371, 2131099, 2191531, 2397951, 2473929, 2541601, 2576089, 2931991, 2965569, 3098059, 3608251, 3885579, 3999399, 4095859 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A123159(4) = a(1).

a(n) is a Sierpiński number if it is of the form 6*m + 1.

LINKS

Table of n, a(n) for n=1..30.

CROSSREFS

Cf. A076336, A123159, A251757.

Sequence in context: A043591 A022256 A237925 * A256002 A225560 A234402

Adjacent sequences:  A251054 A251055 A251056 * A251058 A251059 A251060

KEYWORD

nonn

AUTHOR

Arkadiusz Wesolowski, Dec 15 2014

STATUS

approved

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Last modified October 21 05:02 EDT 2019. Contains 328291 sequences. (Running on oeis4.)