id:A066462 - OEIS Search Results

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

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1, 5, 221, 763, 2759, 11303, 12749, 13079, 20677, 33725, 42253, 75101, 96193, 140225, 160369, 168113, 171667, 195889, 227099, 229969, 269161, 275971, 316129, 344317, 385033, 387163, 392677, 437999, 498253, 528209, 562913, 611381, 661181 (list; graph; listen)

	OFFSET	`1,2`
	MATHEMATICA	`Select[Range[1, 10^6], EulerPhi[DivisorSigma[1, EulerPhi[ # ]]] == DivisorSigma[1, # ] &]`
	CROSSREFS	`Adjacent sequences: A066459 A066460 A066461 this_sequence A066463 A066464 A066465` `Sequence in context: A119657 A024070 A050617 this_sequence A046193 A112999 A002142`
	KEYWORD	`nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Jan 02 2002`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.

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