A156300 Primes p such that 4*p - 5 is also prime.

2, 3, 7, 13, 19, 43, 61, 67, 79, 97, 109, 127, 151, 163, 181, 211, 223, 229, 277, 307, 331, 373, 379, 397, 457, 463, 523, 601, 607, 613, 673, 727, 733, 751, 757, 853, 883, 907, 919, 967, 1021, 1033, 1069, 1117, 1171, 1201, 1231, 1237, 1321, 1327, 1381, 1399

Offset: 1

Author

Vincenzo Librandi, Feb 07 2009

Keywords

• nonn
• easy

Links

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

Crossrefs

Cf. A156287, A156288.

Programs

Magma

[p: p in PrimesUpTo(1400) | IsPrime(4*p - 5)]; // Vincenzo Librandi, Oct 31 2012

Mathematica

Select[Prime[Range[1400]], PrimeQ[(4# - 5)]&] (* Vincenzo Librandi, Oct 31 2012 *)