

A139020


a(n) = sum_{k=1 to n} A139019(k).


2



1, 3, 8, 19, 32, 49, 128, 211, 33554432, 67108933, 2199023255552, 4397979403333, 9007199254740992, 18010000530080323
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OFFSET

1,2


COMMENTS

By definition, every term is a power of a prime.
For all n >= 1, a(2n) = 2^m for some m >= 0.
The next terms a(14) = 2^1685, a(15) = 2^1686  18010000529304693 are too large to be listed here. Max Alekseyev, Oct 14 2012


LINKS



CROSSREFS



KEYWORD

nonn


AUTHOR



EXTENSIONS



STATUS

approved



