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A137288 Numbers k such that 2*prime(k)-1 is prime. 6
1, 2, 4, 8, 11, 12, 22, 25, 34, 37, 46, 47, 50, 58, 63, 67, 68, 73, 75, 85, 95, 101, 106, 110, 111, 114, 121, 125, 129, 141, 145, 151, 159, 163, 168, 169, 180, 193, 203, 207, 211, 222, 226, 232, 242, 254, 258, 260, 274, 285 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
EXAMPLE
k=11: 2*prime(11) - 1 = 2*31 - 1 = 61 is prime, so k=11 belongs to the sequence.
CROSSREFS
Cf. A000040, A005382 (corresponding primes).
Sequence in context: A274924 A080152 A136994 * A247524 A116443 A243181
KEYWORD
easy,nonn
AUTHOR
Ctibor O. Zizka, Apr 05 2008
EXTENSIONS
More terms from Paolo P. Lava, Apr 15 2008
STATUS
approved

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Last modified March 29 09:59 EDT 2024. Contains 371268 sequences. (Running on oeis4.)