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A038869 Twin primes n and n-2 where 2n-1 is also prime. +0
1
7, 19, 31, 139, 199, 229, 271, 601, 619, 661, 811, 829, 1279, 1429, 1609, 2029, 2089, 2131, 2311, 2551, 2791, 3169, 3331, 3391, 3529, 3769, 4051, 4159, 4231, 4261, 4339, 4639, 4801, 5419, 5479, 5659, 5851, 6271, 6301, 6361, 6691, 6961, 7561, 7951, 8539 (list; graph; listen)
OFFSET

0,1

CROSSREFS

Cf. A005382.

Sequence in context: A141338 A145042 A153892 this_sequence A147503 A147465 A053591

Adjacent sequences: A038866 A038867 A038868 this_sequence A038870 A038871 A038872

KEYWORD

nonn

AUTHOR

Thomas Kellar (tkellar(AT)fsp.com)

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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.


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