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A139298
a(n) = 2^(2p - 1)/4, where p is the n-th Mersenne prime A000668(n).
4
8, 2048, 576460752303423488, 3618502788666131106986593281521497120414687020801267626233049500247285301248
OFFSET
1,1
FORMULA
a(n) = 2^(2*A000668(n) - 1)/4 = A139294(n)/4.
CROSSREFS
Sequence in context: A299306 A299464 A300107 * A004819 A001375 A281651
KEYWORD
nonn
AUTHOR
Omar E. Pol, Apr 13 2008
STATUS
approved