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Search: id:A071422
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| A071422 |
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a(n) = a(n-1) + sum of decimal digits of sigma(n), the sum of divisors of n. |
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+0
1
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| 1, 4, 8, 15, 21, 24, 32, 38, 42, 51, 54, 64, 69, 75, 81, 85, 94, 106, 108, 114, 119, 128, 134, 140, 144, 150, 154, 165, 168, 177, 182, 191, 203, 212, 224, 234, 245, 251, 262, 271, 277, 292, 300, 312, 327, 336, 348, 355, 367, 379, 388, 405, 414, 417, 426, 429
(list; graph; listen)
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OFFSET
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1,2
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MATHEMATICA
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s=0; Do[s=s+Apply[Plus, IntegerDigits[DivisorSigma[1, n]]]; Print[s], {n, 1, 128}]
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CROSSREFS
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Cf. A037123, A000788, A051351.
Sequence in context: A130826 A104101 A136403 this_sequence A113902 A024916 A102216
Adjacent sequences: A071419 A071420 A071421 this_sequence A071423 A071424 A071425
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KEYWORD
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base,easy,nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), May 27 2002
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