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A139297 2^(2p - 1)/2-1, where p is a Mersenne prime A000668(n). 3
15, 4095, 1152921504606846975 (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)/2-1 = A139296(n)-1.

CROSSREFS

Sequence in context: A198524 A208463 A172322 * A211251 A208469 A070907

Adjacent sequences:  A139294 A139295 A139296 * A139298 A139299 A139300

KEYWORD

bref,nonn

AUTHOR

Omar E. Pol, Apr 13 2008

STATUS

approved

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Last modified November 28 14:16 EST 2014. Contains 250361 sequences.