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A076376 Numbers n such that n, 2n and 4n are balanced numbers, all are in A020492. 2
3, 35, 105, 210, 1045, 1485, 2970, 3135, 6270, 24871, 29029, 35343, 39105, 50065, 58435, 64285, 70686, 71145, 74613, 78210, 87087, 87685, 124605, 137885, 140335, 142290, 149226, 150195, 174174, 175305, 176715, 192855, 249210, 263055, 300390, 350610, 373065 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Donovan Johnson, Table of n, a(n) for n = 1..1000

MATHEMATICA

f[x_] := DivisorSigma[1, x]/EulerPhi[x] Do[s=f[n]; s1=f[2*n]; s2=f[4*n]; If[IntegerQ[s]&&IntegerQ[s1]&&IntegerQ[s2], Print[n]], {n, 1, 1000000}]

CROSSREFS

Cf. A000010, A000203, A055234, A020492, A076375.

Sequence in context: A001539 A113854 A231645 * A133710 A130061 A274875

Adjacent sequences:  A076373 A076374 A076375 * A076377 A076378 A076379

KEYWORD

nonn

AUTHOR

Labos Elemer, Oct 15 2002

STATUS

approved

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Last modified August 18 07:11 EDT 2019. Contains 326072 sequences. (Running on oeis4.)