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A139297
2^(2p - 1)/2-1, where p is a Mersenne prime A000668(n).
3
15, 4095, 1152921504606846975
OFFSET
1,1
FORMULA
a(n) = 2^(2*A000668(n)-1)/2-1 = A139296(n)-1.
CROSSREFS
Sequence in context: A374796 A374335 A172322 * A211251 A208469 A070907
KEYWORD
bref,nonn
AUTHOR
Omar E. Pol, Apr 13 2008
STATUS
approved