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Search: id:A004538
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| -1, 5, 17, 35, 59, 89, 125, 167, 215, 269, 329, 395, 467, 545, 629, 719, 815, 917, 1025, 1139, 1259, 1385, 1517, 1655, 1799, 1949, 2105, 2267, 2435, 2609, 2789, 2975, 3167, 3365, 3569, 3779, 3995, 4217, 4445
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OFFSET
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0,2
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FORMULA
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a(n) = 5 * Sum[k^4,{k,1,n}] / Sum[k^2,{k,1,n}], n>0. a(n) = 5 * A000538(n) / A000330(n), n>0. - Alexander Adamchuk (alex(AT)kolmogorov.com), Apr 12 2006
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MATHEMATICA
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Table[5*Sum[k^4, {k, 1, n}]/Sum[k^2, {k, 1, n}], {n, 1, 20}] - Alexander Adamchuk (alex(AT)kolmogorov.com), Apr 12 2006
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CROSSREFS
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First differences of A033445. Cf. A028896, A003215, A077588.
Cf. A000538, A000330.
Sequence in context: A078654 A083364 A026394 this_sequence A083048 A123669 A121325
Adjacent sequences: A004535 A004536 A004537 this_sequence A004539 A004540 A004541
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KEYWORD
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sign
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AUTHOR
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njas, Eric T. Lane (ERICLANE(AT)UTCVM.UTC.EDU)
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