A147683 Numbers n with property that 6n-1 is in A053182.

1, 3, 7, 10, 12, 15, 17, 22, 28, 29, 49, 64, 113, 117, 124, 127, 129, 138, 140, 143, 152, 182, 183, 194, 197, 199, 203, 229, 238, 248, 260, 264, 285, 302, 308, 322, 329, 355, 379, 385, 390, 402, 444, 455, 465, 493, 495, 502, 507, 523, 537, 542, 568, 575, 582

Offset: 1

Author

Zak Seidov, Nov 10 2008

Keywords

• nonn

Crossrefs

Cf. A053182.

Programs

PARI

isok(n) = isprime(p=6*n-1) && isprime(p^2+p+1); \\ Michel Marcus, Oct 15 2013