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Search: id:A074963
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| A074963 |
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Max ( sigma(x*y) : 1<=x<=n, 1<=y<=n ). |
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+0
1
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| 1, 7, 13, 31, 42, 91, 96, 127, 195, 234, 234, 403, 403, 480, 576, 744, 744, 847, 847, 1170, 1344, 1344, 1344, 1651, 1860, 1860, 1860, 2240, 2240, 2880, 2880, 3048, 3048, 3048, 3048, 4368, 4368, 4368, 4368, 5040, 5040, 5952, 5952, 5952, 6552, 6552, 6552
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Does a(n)=sigma(n^2) for a finite number of values of n (1,2,3,4,6,8,12,18,24,60) ?
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PROGRAM
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(PARI) a(n)=vecmax(matrix(n, n, x, y, sigma(x*y)))
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CROSSREFS
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Sequence in context: A046139 A023243 A087196 this_sequence A110912 A085104 A162652
Adjacent sequences: A074960 A074961 A074962 this_sequence A074964 A074965 A074966
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KEYWORD
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easy,nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Oct 05 2002
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