A139299 2^(2p - 1)/4-1, where p is a Mersenne prime A000668(n).

7, 2047, 576460752303423487

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