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A139020
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a(n) = sum_{k=1 to n} A139019(k)).
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2
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1, 3, 8, 19, 32, 49, 128, 211, 33554432, 67108933, 2199023255552, 4397979403333, 9007199254740992, 18010000530080323
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| By definition, every term is a power of a prime.
For all n >= 1, a(2n) = 2^m, m >= 0.
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CROSSREFS
| Cf. A139019, A139022.
Sequence in context: A171308 A113535 A184444 * A147358 A086167 A083186
Adjacent sequences: A139017 A139018 A139019 * A139021 A139022 A139023
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KEYWORD
| more,nonn
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AUTHOR
| Leroy Quet Apr 06 2008
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EXTENSIONS
| Corrected and extended by M. F. Hasler (www.univ-ag.fr/~mhasler), Apr 07 2008
a(10)-a(13) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Nov 30 2008
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