id:A076375 - OEIS Search Results

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Both n and 2n are balanced numbers, are in A020492.

+0
4

1, 3, 6, 15, 35, 70, 105, 210, 357, 420, 1045, 1485, 2090, 2970, 3135, 3339, 5049, 5940, 6270, 10659, 12441, 12540, 16065, 24871, 24969, 29029, 33915, 35343, 39105, 39585, 49742, 50065, 58058, 58435, 64285, 70686, 71145, 74613, 78210, 87087 (list; graph; listen)

	OFFSET	`1,2`
	MATHEMATICA	`f[x_] := DivisorSigma[1, x]/EulerPhi[x] Do[s=f[n]; s1=f[2*n]; If[IntegerQ[s]&&IntegerQ[s1], Print[n]], {n, 1, 100000}]`
	CROSSREFS	`Cf. A000010, A000203, A055234.` `Sequence in context: A032176 A027600 A024416 this_sequence A113225 A017924 A052827` `Adjacent sequences: A076372 A076373 A076374 this_sequence A076376 A076377 A076378`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Oct 15 2002`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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