id:A067701 - OEIS Search Results

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n satisfying phi(n-1) + phi(n+1) = phi(2n).

+0
3

5, 7, 25, 77, 217, 305, 3665, 4645, 5065, 8815, 12205, 12545, 19877, 20435, 24235, 29545, 37735, 47995, 60115, 72085, 73025, 77045, 87475, 121145, 126055, 129245, 149755, 190267, 234635, 247855, 273295, 275723, 419365, 531235, 553475, 621725 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`phi(25-1) + phi(25+1) = 8+12 = phi(2*25), so 25 is in the sequence.`
	MATHEMATICA	`Select[Range[10^5], EulerPhi[ # - 1] + EulerPhi[ # + 1] == EulerPhi[2# ] &]`
	CROSSREFS	`Cf. A000010.` `Cf. A066231.` `Sequence in context: A018319 A100095 A013626 this_sequence A059240 A135606 A051845` `Adjacent sequences: A067698 A067699 A067700 this_sequence A067702 A067703 A067704`
	KEYWORD	`nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Feb 05 2002`
	EXTENSIONS	`Edited by Dean Hickerson (dean(AT)math.ucdavis.edu), Feb 12 2002`

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Last modified July 6 17:22 EDT 2008. Contains 140988 sequences.

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