A251057 Odd numbers n not congruent to 5 mod 6 such that for all k >= 1 the numbers n*4^k + 1 are composite.

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

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: A022256 A237925 A374953 * A256002 A225560 A234402

Adjacent sequences: A251054 A251055 A251056 * A251058 A251059 A251060

Keyword

nonn

Author

Arkadiusz Wesolowski, Dec 15 2014

Status

approved