A023216 Primes p such that 4*p + 9 is also prime.

2, 5, 7, 11, 13, 23, 37, 41, 43, 47, 67, 71, 97, 103, 113, 137, 151, 163, 167, 173, 181, 191, 197, 211, 233, 251, 263, 271, 277, 293, 307, 317, 397, 401, 421, 431, 433, 463, 467, 491, 557, 571, 587, 593, 607, 617, 653, 683, 727, 757, 811, 823, 863, 877, 881, 883, 887, 907

Offset: 1

Author

David W. Wilson

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..4000

Programs

Magma

[n: n in [0..1000] | IsPrime(n) and IsPrime(4*n+9)]; // Vincenzo Librandi, Nov 19 2010

Mathematica

Select[Prime[Range[2000]], PrimeQ[4# + 9]&] (* Vincenzo Librandi, Feb 02 2014 *)