A155779 Primes p such that 2^(p-1)+7 is prime.

3, 5, 7, 11, 17, 19, 29, 31, 79, 89, 127, 1889, 3511, 8971, 13331

Offset: 1

Author

Vincenzo Librandi, Jan 27 2009

Keywords

• nonn

Comments

Primes of the form 1+A057195(k). [R. J. Mathar, Feb 19 2009]

Programs

Mathematica

Select[Prime[Range[15000]], PrimeQ[(2^(# - 1) + 7)] &] (* Vincenzo Librandi, Jun 24 2013 *)