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A138827
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Sum of digits of n-th even superperfect number A061652(n).
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0
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2, 4, 7, 10, 19, 25, 19, 37, 82, 115, 142, 172, 745, 856, 1603, 2980, 3079, 4240, 5812, 5842, 13165, 13480, 15136, 27052, 29455, 31339, 60112, 116386, 149239, 179821, 291511, 1025683, 1164760
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Also, sum of digits of n-th superperfect number A019279(n), if there are not odd superperfect numbers.
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CROSSREFS
| Cf. A007605, A019279, A061652, A066538, A138128.
Sequence in context: A049630 A032705 A088762 * A173730 A036685 A034744
Adjacent sequences: A138824 A138825 A138826 * A138828 A138829 A138830
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KEYWORD
| base,more,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Apr 01 2008
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EXTENSIONS
| a(10)-a(33) from R. Mathar (mathar(AT)strw.leidenuniv.nl), May 22 2008
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