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Search: id:A048969
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| A048969 |
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Numbers n such that n is composite and sigma(n) / d(n) is prime. |
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+0
4
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| 6, 20, 45, 49, 150, 169, 361, 832, 961, 1445, 1734, 1849, 5329, 8405, 9409, 9477, 10086, 10609, 14580, 14641, 16129, 17405, 20886, 24649, 25205, 30246, 39601, 39605, 47526, 49729, 51005, 58081, 61206
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..259
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EXAMPLE
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For n=6 (composite), sigma(6)=12, d(6)=4 and 12/4 = 3 is prime.
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CROSSREFS
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Cf. A000203, A000005, A000043, A048968.
Sequence in context: A094279 A093913 A006137 this_sequence A005564 A011928 A055455
Adjacent sequences: A048966 A048967 A048968 this_sequence A048970 A048971 A048972
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KEYWORD
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nice,easy,nonn
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AUTHOR
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G. L. Honaker, Jr. (honak3r(AT)gmail.com)
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EXTENSIONS
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More terms from Michel ten Voorde (seqfan(AT)tenvoorde.org)
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