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A139291 (2^(2p - 1)/4)-1, where p is the n-th prime. 7
1, 7, 127, 2047, 524287, 8388607, 2147483647, 34359738367, 8796093022207, 36028797018963967, 576460752303423487, 2361183241434822606847, 604462909807314587353087, 9671406556917033397649407 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..14.

FORMULA

a(n)=(A139286(n)/4)-1.

MATHEMATICA

(2^(2#-1))/4-1&/@Prime[Range[20]] (* Harvey P. Dale, May 08 2011 *)

CROSSREFS

Cf. A139286, A139287, A139288, A139289, A139290, A139291, A139293, A139294, A139306.

Sequence in context: A267249 A025166 A241955 * A274673 A215066 A092676

Adjacent sequences:  A139288 A139289 A139290 * A139292 A139293 A139294

KEYWORD

nonn

AUTHOR

Omar E. Pol, Apr 13 2008

EXTENSIONS

Edited by Max Alekseyev, May 03 2009

STATUS

approved

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Last modified March 21 20:18 EDT 2019. Contains 321382 sequences. (Running on oeis4.)