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Search: id:A067384
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| A067384 |
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Numbers n such that sigma(phi(n))/sigma(n) = 4. |
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5
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| 121679, 1043909, 2350171, 2918263, 3396103, 3566807, 3688067, 4019467, 4562827, 5963407, 7300697, 7485979, 7853933, 8103301, 8364151, 9237779, 9514213, 9638527, 10531123, 11094619, 11384447, 12721937, 13576267
(list; graph; listen)
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OFFSET
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1,1
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MATHEMATICA
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For[ n=1, True, n++, If[ DivisorSigma[ 1, EulerPhi[ n ] ]/DivisorSigma[ 1, n ]==4, Print[ n ] ] ]
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CROSSREFS
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Cf. A033631, A066831, A067382, A067383, A067385.
Sequence in context: A068136 A135495 A066881 this_sequence A048903 A115545 A104973
Adjacent sequences: A067381 A067382 A067383 this_sequence A067385 A067386 A067387
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KEYWORD
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nonn
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AUTHOR
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Dean Hickerson (dean(AT)math.ucdavis.edu), Jan 20 2002
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