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A158298
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Denominators of averages of squares of the divisors of n.
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0
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1, 2, 1, 1, 1, 4, 1, 4, 3, 4, 1, 1, 1, 4, 1, 5, 1, 6, 1, 1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Average of squares of the divisors of n = A001157(n)/A000005(n). Iff a(n) = 1, n is in A020486. Numerators of averages of squares of divisors of n: 1,5,5,7,13,50,25,85,91,130,61,35,85,250,65,341,145,455,181,91,...
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CROSSREFS
| Cf. A001157, A000005, A020486.
Sequence in context: A174204 A118106 A143201 * A112331 A133910 A066441
Adjacent sequences: A158295 A158296 A158297 * A158299 A158300 A158301
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KEYWORD
| nonn
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AUTHOR
| Jaroslav Krizek (jaroslav.krizek(AT)atlas.cz), Mar 15 2009
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