A175234 Primes p such that 2^p+15 is also prime.

2, 3, 5, 11, 23, 61

Offset: 1

Author

Vincenzo Librandi, Mar 09 2010

Keywords

• nonn

Comments

No additional terms through n=5000. - Harvey P. Dale, Apr 13 2014

a(7) > 5*10^5. - Robert Price, Sep 18 2015

Examples

			For p=2, 2^2+15=19; p=3, 2^3+15=23; p=5, 2^5+15=47.
		

Programs

Magma

[p: p in PrimesUpTo(6000) | IsPrime(2^p+15) ]

Mathematica

Select[Prime[Range[1000]],PrimeQ[2^#+15]&] (* Harvey P. Dale, Apr 13 2014 *)

Formula

A000040 INTERSECT A057197. [R. J. Mathar, May 02 2010]