id:A066471 - OEIS Search Results

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

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1, 2, 8, 12, 128, 240, 350, 366, 368, 575, 671, 720, 743, 1098, 2417, 6912, 18967, 19399, 32768, 142560, 173340, 179010, 184032, 188892, 203310, 209628, 225342, 228582, 232160, 244782, 255460, 271072, 274422, 279045, 282285, 287810, 304910 (list; graph; listen)

	OFFSET	`1,2`
	MATHEMATICA	`Select[Range[1, 10^6], DivisorSigma[1, EulerPhi[DivisorSigma[1, # ]]] == DivisorSigma[1, # ] &]`
	CROSSREFS	`Sequence in context: A083546 A013190 A126192 this_sequence A001229 A120000 A067678` `Adjacent sequences: A066468 A066469 A066470 this_sequence A066472 A066473 A066474`
	KEYWORD	`nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Jan 02 2002`

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Last modified December 1 13:27 EST 2009. Contains 167806 sequences.

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