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A139299 2^(2p - 1)/4-1, where p is a Mersenne prime A000668(n). 3
7, 2047, 576460752303423487 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..3.

FORMULA

a(n) = 2^(2*A000668(n)-1)/4-1 = A139294(n)/4-1 = A139298(n)-1.

CROSSREFS

Sequence in context: A248730 A024099 A056235 * A004818 A125538 A129732

Adjacent sequences:  A139296 A139297 A139298 * A139300 A139301 A139302

KEYWORD

bref,nonn

AUTHOR

Omar E. Pol, Apr 13 2008

STATUS

approved

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Last modified February 18 09:56 EST 2019. Contains 320250 sequences. (Running on oeis4.)