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A139287 2^(2p - 1) - 1, where p is prime. 10
7, 31, 511, 8191, 2097151, 33554431, 8589934591, 137438953471, 35184372088831, 144115188075855871, 2305843009213693951, 9444732965739290427391, 2417851639229258349412351, 38685626227668133590597631 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..200

MATHEMATICA

Table[(2^(2 Prime[n] - 1) - 1), {n, 1, 20}] (* Vincenzo Librandi, May 24 2014 *)

PROG

(MAGMA)[2^(2*p-1)-1: p in PrimesUpTo(200)]; // Vincenzo Librandi, Dec 15 2010

CROSSREFS

Cf. A000040, A000079, A076274, A139286, A139288, A139289, A139290, A139291, A139292, A139293, A139294, A139306.

Sequence in context: A322894 A232993 A135630 * A139307 A197451 A289729

Adjacent sequences:  A139284 A139285 A139286 * A139288 A139289 A139290

KEYWORD

nonn,easy

AUTHOR

Omar E. Pol, Apr 13 2008

EXTENSIONS

a(9) corrected by Vincenzo Librandi, May 24 2014

STATUS

approved

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Last modified April 18 16:51 EDT 2019. Contains 322210 sequences. (Running on oeis4.)