id:A055696 - OEIS Search Results

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Numbers n such that n | Sigma_2(n) + Phi(n)^2.

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1, 2, 6, 182, 330, 850, 2150, 5964, 23028, 85800, 168150, 172250, 179850, 308700, 391300, 484692, 507725, 1098750, 1248148, 1377075 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`sigma_2(n) is the sum of the squares of the divisors of n (A001157).`
	MATHEMATICA	`Do[If[Mod[DivisorSigma[2, n]+EulerPhi[n]^2, n]==0, Print[n]], {n, 1, 2*10^6}]`
	CROSSREFS	`Adjacent sequences: A055693 A055694 A055695 this_sequence A055697 A055698 A055699` `Sequence in context: A135937 A137532 A072116 this_sequence A091439 A013083 A110387`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 09 2000`

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Last modified May 16 23:01 EDT 2008. Contains 139884 sequences.

AT&T Labs Research