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A023223 Numbers n such that n and 7n + 2 both prime. 0
3, 5, 11, 23, 47, 53, 71, 101, 107, 131, 167, 173, 197, 251, 257, 293, 311, 317, 353, 383, 431, 461, 467, 563, 587, 593, 683, 701, 773, 797, 821, 827, 863, 887, 911, 953, 977, 983, 1031, 1091, 1097, 1103, 1151, 1181, 1187, 1193, 1217, 1223, 1277, 1301, 1307, 1373 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

PROG

(MAGMA) [n: n in [0..100000] | IsPrime(n) and IsPrime(7*n+2)] [From Vincenzo Librandi, Nov 19 2010]

CROSSREFS

Sequence in context: A155753 A133914 A169913 * A106086 A072828 A032803

Adjacent sequences:  A023220 A023221 A023222 * A023224 A023225 A023226

KEYWORD

nonn

AUTHOR

David W. Wilson (davidwwilson(AT)comcast.net)

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Last modified February 15 21:23 EST 2012. Contains 205856 sequences.