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A139295
2^(2p - 1)-1, where p is a Mersenne prime A000668(n).
4
31, 8191, 2305843009213693951, 14474011154664524427946373126085988481658748083205070504932198000989141204991
OFFSET
1,1
FORMULA
a(n) = 2^(2*A000668(n)-1)-1 = A139294(n)-1.
CROSSREFS
Sequence in context: A136676 A135811 A119598 * A261947 A069451 A374668
KEYWORD
nonn
AUTHOR
Omar E. Pol, Apr 13 2008
STATUS
approved