A023222 Primes p such that 6*p + 7 is also prime.

2, 5, 11, 17, 29, 31, 37, 61, 67, 71, 89, 101, 109, 127, 137, 167, 181, 191, 199, 229, 241, 257, 269, 277, 281, 311, 331, 337, 347, 359, 379, 389, 397, 419, 431, 457, 491, 499, 509, 541, 571, 577, 587, 601, 617, 631, 641, 647, 691, 709, 739, 751, 757, 769, 787, 797, 809

Offset

1,1

Links

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

Mathematica

Select[Prime[Range[200]], PrimeQ[6#+7]&] (* Harvey P. Dale, Nov 25 2012 *)

Prog

(Magma) [n: n in PrimesUpTo(900) | IsPrime(6*n+7)]; // Vincenzo Librandi, Nov 19 2010
(PARI) is(n)=isprime(6*n+7) && isprime(n) \\ Charles R Greathouse IV, Apr 18 2020

Crossrefs

Intersection of A153218 and A000040.

Cf. A153219.

Sequence in context: A038390 A048210 A153222 * A289250 A278049 A007491

Adjacent sequences: A023219 A023220 A023221 * A023223 A023224 A023225

Keyword

nonn,easy

Author

David W. Wilson

Status

approved