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 A023221 Numbers n such that n and 6n + 5 both prime. 12
 2, 3, 7, 11, 13, 17, 29, 31, 37, 41, 43, 59, 71, 73, 79, 83, 97, 107, 109, 113, 137, 139, 151, 157, 163, 181, 191, 193, 197, 227, 239, 241, 251, 263, 269, 277, 307, 311, 317, 337, 347, 349, 367, 373, 389, 401, 409, 421, 431, 443, 449, 479, 487, 499, 503, 541, 557, 577, 587 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 MATHEMATICA Select[Prime[Range[1000]], PrimeQ[6 # + 5] &] (* Vincenzo Librandi, May 20 2014 *) PROG (MAGMA) [n: n in PrimesUpTo(100) | IsPrime(6*n+5)]; // Vincenzo Librandi, Nov 20 2010 CROSSREFS Subsequence of A059325. Sequence in context: A045322 A296931 A278698 * A127430 A171595 A106483 Adjacent sequences:  A023218 A023219 A023220 * A023222 A023223 A023224 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified June 19 17:16 EDT 2019. Contains 324222 sequences. (Running on oeis4.)