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A139304
2^(2p - 1)/32, where p is a Mersenne prime A000668(n).
3
1, 256, 72057594037927936
OFFSET
1,2
FORMULA
a(n) = 2^(2*A000668(n)-1)/32 = A139294(n)/32.
CROSSREFS
Sequence in context: A185981 A255321 A228133 * A018859 A180699 A195529
KEYWORD
bref,nonn
AUTHOR
Omar E. Pol, Apr 13 2008
STATUS
approved