id:A066463 - OEIS Search Results

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Numbers n such that EulerPhi(sigma(EulerPhi(n))) = EulerPhi(n).

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1, 2, 3, 4, 6, 13, 15, 16, 20, 21, 24, 26, 28, 30, 36, 42, 241, 255, 256, 272, 287, 305, 320, 325, 340, 369, 384, 385, 408, 429, 465, 480, 482, 488, 495, 496, 510, 525, 572, 574, 610, 616, 620, 650, 700, 732, 738, 744, 770, 779, 792, 793, 803, 858, 900, 905 (list; graph; listen)

	OFFSET	`1,2`
	MATHEMATICA	`Select[Range[1, 10^3], EulerPhi[DivisorSigma[1, EulerPhi[ # ]]] == EulerPhi[ # ] &]`
	CROSSREFS	`Adjacent sequences: A066460 A066461 A066462 this_sequence A066464 A066465 A066466` `Sequence in context: A018738 A018765 A096988 this_sequence A073146 A038767 A095991`
	KEYWORD	`nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Jan 02 2002`

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Last modified October 15 20:12 EDT 2008. Contains 145099 sequences.

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