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Search: id:A005231
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| 945, 1575, 2205, 2835, 3465, 4095, 4725, 5355, 5775, 5985, 6435, 6615, 6825, 7245, 7425, 7875, 8085, 8415, 8505, 8925, 9135, 9555, 9765, 10395, 11025, 11655, 12285, 12705, 12915, 13545, 14175, 14805, 15015, 15435, 16065, 16695, 17325, 17955
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OFFSET
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1,1
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REFERENCES
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L. E. Dickson, Amer. J. Math., 35 (1913), 413-426.
W. Dunham, Euler: The Master of Us All, The Mathematical Association of America Inc., Washington, D.C., 1999, p. 13.
R. K. Guy, Unsolved Problems in Number Theory, B2.
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..1000
Walter Nissen, Abundancy : Some Resources
Jill Britton, Perfect Number Analyzer.
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PROGRAM
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(PARI) je=[ ]; forstep(n=1, 15000, 2, x=sigma(n); if(x>(2*n), je=concat(je, n))); je
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CROSSREFS
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Cf. A006038, A005101, A064001.
Adjacent sequences: A005228 A005229 A005230 this_sequence A005232 A005233 A005234
Sequence in context: A133814 A104438 A125013 this_sequence A006038 A127667 A109729
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms from James A. Sellers (sellersj(AT)math.psu.edu)
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