A165811 Primes of the form 18*p+1, where p is also a prime.

37, 127, 199, 307, 523, 739, 1063, 1279, 1423, 1747, 2287, 2467, 2503, 2683, 2719, 3259, 3547, 3583, 4339, 4519, 4987, 5059, 5527, 6067, 6247, 6607, 6823, 7219, 7759, 8623, 8839, 9739, 10243, 10567, 11863, 12619, 12763, 13627, 14347, 14563, 14779, 14887

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Formula

a(n) = 1+18*A165810(n).

Example

p=2 contributes 37=18*2+1. p=7 contributes 127=18*7+1. p=11 contributes 199=18*11+1

Mathematica

Select[Table[18p + 1, {p, Prime[Range[400]]}], PrimeQ] (* Vincenzo Librandi, Oct 13 2012 *)

Prog

(Magma) [a: p in PrimesInInterval(2, 1000) | IsPrime(a) where a is 18*p + 1]; // Vincenzo Librandi, Oct 13 2012

Crossrefs

Cf. A111094, A153400, A165810.

Sequence in context: A048510 A250891 A250898 * A142331 A250899 A139734

Adjacent sequences: A165808 A165809 A165810 * A165812 A165813 A165814

Keyword

nonn,easy

Author

Vincenzo Librandi, Sep 28 2009

Extensions

Extended by R. J. Mathar, Oct 16 2009

Status

approved