id:A077457 - OEIS Search Results

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sigma(n^4,4)/sigma(n^4,2).

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1, 205, 5905, 52429, 375601, 1210525, 5649505, 13421773, 38742049, 76998205, 212601841, 309593245, 810932305, 1158148525, 2217923905, 3435973837, 6951703105, 7942120045, 16936647121, 19692384829, 33360327025, 43583377405 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`sigma(n^x,y) divides sigma(n^x,x) for all n if y divides x.`
	FORMULA	`a(n)=A001159(n^4)/A001157(n^4)`
	PROGRAM	`(PARI) a(n)=sumdiv(n^4, d, d^4)/sumdiv(n^4, d, d^2)`
	CROSSREFS	`Cf. A057660.` `Sequence in context: A042983 A020170 A015974 this_sequence A060892 A015289 A080529` `Adjacent sequences: A077454 A077455 A077456 this_sequence A077458 A077459 A077460`
	KEYWORD	`nonn,mult`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Nov 30 2002`

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Last modified March 17 15:31 EDT 2010. Contains 173524 sequences.

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