A201541 Numbers n such that 12n+5 and 12n+7 are primes.

0, 1, 2, 3, 8, 11, 12, 16, 22, 23, 38, 43, 47, 51, 53, 67, 68, 71, 73, 87, 88, 102, 106, 107, 108, 123, 141, 143, 156, 162, 166, 173, 177, 178, 186, 192, 198, 212, 221, 227, 232, 233, 247, 271, 277, 282, 288, 296, 298, 318, 326, 327, 333, 337, 346, 351, 352

Offset: 0

Author

Zak Seidov, Dec 02 2011

Keywords

• nonn

Comments

A123979 and A123985 are subsequences.

Crossrefs

Cf. A123985, A123986, A123979.

Programs

Mathematica

Select[Range[0, 352], PrimeQ[12 # + 5] && PrimeQ[12 # + 7] &] (* T. D. Noe, Dec 05 2011 *)

Formula

a(n)=(A123986(n)-1)/3.