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.

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

Offset

1,1

Comments

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

Links

Table of n, a(n) for n=1..23.

Crossrefs

Cf. A076504.

Sequence in context: A264040 A013796 A055312 * A296138 A350542 A159951

Adjacent sequences: A365239 A365240 A365241 * A365243 A365244 A365245

Keyword

nonn

Author

Joshua Graham, Aug 28 2023

Status

approved