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A062731
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Sum of divisors of 2*n.
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5
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3, 7, 12, 15, 18, 28, 24, 31, 39, 42, 36, 60, 42, 56, 72, 63, 54, 91, 60, 90, 96, 84, 72, 124, 93, 98, 120, 120, 90, 168, 96, 127, 144, 126, 144, 195, 114, 140, 168, 186, 126, 224, 132, 180, 234, 168, 144, 252, 171, 217, 216, 210, 162, 280, 216, 248, 240, 210
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OFFSET
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1,1
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,1000
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FORMULA
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a(n)= A000203(2*n). - R. J. Mathar, Apr 06 2011
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MATHEMATICA
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lst={}; Do[AppendTo[lst, DivisorSigma[1, n]], {n, 2, 6!, 2}]; lst [From Vladimir Orlovsky, Sep 20 2008]
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PROG
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(PARI) vector(66, n, sigma(2*n, 1))
(MuPad) numlib::sigma(2*n)$ n=0..81 - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 13 2008
(PARI) { for (n=1, 1000, write("b062731.txt", n, " ", sigma(2*n)) ) } [From Harry J. Smith, Aug 09 2009]
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CROSSREFS
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Cf. A008438, A074400.
Sequence in context: A081695 A142958 A187481 * A083031 A189927 A189403
Adjacent sequences: A062728 A062729 A062730 * A062732 A062733 A062734
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KEYWORD
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easy,nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Jul 11 2001
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EXTENSIONS
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Zero removed and offset corrected by Omar E. Pol, Jul 17 2009
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STATUS
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approved
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