id:A084218 - OEIS Search Results

Search: id:A084218

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a(n)=sigma_4(n^2)/sigma_2(n^2).

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1, 13, 73, 205, 601, 949, 2353, 3277, 5905, 7813, 14521, 14965, 28393, 30589, 43873, 52429, 83233, 76765, 129961, 123205, 171769, 188773, 279313, 239221, 375601, 369109, 478297, 482365, 706441, 570349, 922561, 838861, 1060033, 1082029 (list; graph; listen)

	OFFSET	`1,2`
	PROGRAM	`(PARI) a(n)=sumdiv(n^2, d, d^4)/sumdiv(n^2, d, d^2)`
	CROSSREFS	`Cf. A057660.` `Sequence in context: A097402 A139873 A142787 this_sequence A125258 A060886 A081586` `Adjacent sequences: A084215 A084216 A084217 this_sequence A084219 A084220 A084221`
	KEYWORD	`nonn,mult`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Jun 21 2003`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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