A106086 Primes p such that 7*p + 2 and 2*p + 7 are primes.

3, 5, 11, 23, 47, 53, 71, 131, 173, 197, 251, 257, 293, 317, 383, 461, 467, 587, 593, 683, 701, 773, 797, 863, 953, 983, 1031, 1103, 1151, 1187, 1193, 1217, 1301, 1307, 1373, 1451, 1481, 1607, 1721, 1787, 2111, 2207, 2237, 2333, 2633, 2903, 3023, 3221, 3347

Offset

1,1

Links

Michael De Vlieger, Table of n, a(n) for n = 1..10000

Mathematica

Select[Prime[Range[220]], PrimeQ[2#+7]&&PrimeQ[7#+2]&]

Prog

(Magma) [p: p in PrimesUpTo(5000)|IsPrime(7*p+2) and IsPrime(2*p+7)] // Vincenzo Librandi, Jan 30 2011

Crossrefs

Cf. A105760 (2n+7 is prime), A105772 (7n+2 is prime).

Cf. A107438, A023206.

Sequence in context: A169913 A260239 A023223 * A072828 A290114 A032803

Adjacent sequences: A106083 A106084 A106085 * A106087 A106088 A106089

Keyword

nonn

Author

Zak Seidov, May 07 2005

Extensions

More terms from Rick L. Shepherd, Jan 29 2006

Status

approved