A153767 Primes p such that 8*p - 9 is also prime.

2, 5, 7, 11, 17, 29, 31, 47, 59, 61, 109, 131, 137, 139, 167, 179, 181, 197, 199, 229, 251, 269, 277, 281, 307, 337, 347, 367, 379, 397, 419, 421, 449, 467, 479, 491, 521, 557, 599, 601, 619, 631, 641, 647, 661, 677, 691, 719, 727, 739, 757, 761, 769, 787, 797

Offset: 1

Author

Vincenzo Librandi, Jan 01 2009

Keywords

• nonn
• easy

Examples

			For p=31 (a prime), 8*p - 9 = 239 is also prime, so 31 is in the sequence.
		

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..3000

Crossrefs

Cf. A153766.

Programs

Magma

[p: p in PrimesUpTo(1000) | IsPrime(8*p-9)]; // Vincenzo Librandi, Apr 04 2013

Mathematica

Select[Prime[Range[150]], PrimeQ[8 # - 9]&] (* Vincenzo Librandi, Apr 04 2013 *)

Extensions

4 removed, extended by R. J. Mathar, Jan 07 2009