cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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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.

Original entry on oeis.org

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

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Author

Arkadiusz Wesolowski, Dec 15 2014

Keywords

Comments

A123159(4) = a(1).
a(n) is a Sierpiński number if it is of the form 6*m + 1.

Crossrefs

Cf. A076336, A123159, A251757.
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