login
A139301
(2^(2p - 1)/8)-1, where p is a Mersenne prime A000668(n).
3
3, 1023, 288230376151711743
OFFSET
1,1
FORMULA
a(n) = (2^(2*A000668(n)-1)/8)-1 = (A139294(n)/8)-1.
CROSSREFS
Sequence in context: A167069 A024046 A152505 * A004803 A065604 A062612
KEYWORD
bref,nonn
AUTHOR
Omar E. Pol, Apr 13 2008
STATUS
approved