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A068497 Primes p such that 2*p+1 and 2*p-1 are composites. +0
3
13, 17, 43, 47, 59, 61, 67, 71, 73, 101, 103, 107, 109, 127, 137, 149, 151, 163, 167, 181, 193, 197, 223, 227, 241, 257, 263, 269, 277, 283, 311, 313, 317, 347, 349, 353, 373, 383, 389, 397, 401, 409, 421, 433, 449, 457, 461, 463, 467, 479, 487, 503, 521 (list; graph; listen)
OFFSET

1,1

CROSSREFS

Sequence in context: A045267 A043113 A043893 this_sequence A125524 A156553 A140533

Adjacent sequences: A068494 A068495 A068496 this_sequence A068498 A068499 A068500

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 25 2002

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.


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