A063911 Primes p such that 2*p - 9 is also prime.

7, 11, 13, 19, 23, 31, 41, 53, 59, 61, 73, 79, 83, 101, 103, 139, 151, 163, 173, 179, 181, 191, 199, 229, 233, 283, 293, 311, 313, 331, 359, 383, 389, 409, 419, 431, 433, 443, 503, 509, 521, 563, 569, 601, 613, 619, 643, 653, 691, 709, 719

Offset

1,1

Links

Harry J. Smith, Table of n, a(n) for n = 1..1000

Mathematica

Select[Prime[Range[3, 2000]], PrimeQ[2 # - 9]&] (* Vincenzo Librandi, Feb 02 2014 *)

Prog

(PARI) isok(p) = { isprime(p) && isprime(2*p - 9) } \\ Harry J. Smith, Sep 02 2009
(Magma) [n: n in [4..2000] | IsPrime(n) and IsPrime(2*n-9)]; // Vincenzo Librandi, Feb 02 2014

Crossrefs

Sequence in context: A091932 A165349 A160024 * A087489 A155488 A100350

Adjacent sequences: A063908 A063909 A063910 * A063912 A063913 A063914

Keyword

nonn,easy

Author

N. J. A. Sloane, Aug 31 2001

Status

approved