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Search: id:A063731
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| A063731 |
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Numbers n such that Sum_{k=1..n} sigma(k) divides Prod_{k=1..n} sigma(k). |
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+0
1
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| 1, 5, 8, 15, 50, 52, 53, 55, 63, 68, 72, 96, 103, 157, 176, 196, 211, 219, 287, 288, 302, 303, 321, 327, 348, 360, 364, 365, 381, 402, 417, 421, 430, 431, 438, 444, 452, 454, 465, 472, 478, 504, 506, 512, 514, 530, 531, 534, 555, 565, 576, 584, 588, 594, 607
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Matthew M. Conroy, Home page (listed instead of email address)
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PROGRAM
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(PARI) for(n=1, 300, a=sum(k=1, n, sigma(k)); b=prod(k=1, n, sigma(k)); if(Mod(b, a)==0, print(n)))
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CROSSREFS
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Sequence in context: A133641 A112269 A091574 this_sequence A129316 A039752 A065905
Adjacent sequences: A063728 A063729 A063730 this_sequence A063732 A063733 A063734
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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), Aug 12 2001
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EXTENSIONS
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More terms from Matthew M. Conroy, Aug 21 2001
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