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A365242 Numbers k such that k+1, k-1, k/2+1, k/2-1, k/3+1 and k/3-1 are all prime.

Original entry on oeis.org

12, 540540, 928620, 960120, 9074520, 10199700, 26460000, 44186940, 46787580, 66459960, 67723740, 71901900, 94884300, 98698320, 109495260, 115796520, 126556920, 134276940, 140943600, 157861620, 196226100, 197520120, 202498380
Offset: 1

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Author

Joshua Graham, Aug 28 2023

Keywords

Comments

It can be proven that except for a(1) = 12, a(n) = {0, 1260, 3780, 10080, 12600} (mod 13860).

Crossrefs

Cf. A076504.

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