id:A083542 - OEIS Search Results

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a(n)=phi[n+1]*phi[n], product of totients of two consecutive integers.

+0
5

1, 2, 4, 8, 8, 12, 24, 24, 24, 40, 40, 48, 72, 48, 64, 128, 96, 108, 144, 96, 120, 220, 176, 160, 240, 216, 216, 336, 224, 240, 480, 320, 320, 384, 288, 432, 648, 432, 384, 640, 480, 504, 840, 480, 528, 1012, 736, 672, 840, 640, 768, 1248, 936, 720, 960, 864, 1008 (list; graph; listen)

	OFFSET	`1,2`
	CROSSREFS	`Cf. A000010, A066813, A058515, A083538, A083539.` `Sequence in context: A123263 A008218 A073043 this_sequence A088244 A073616 A076735` `Adjacent sequences: A083539 A083540 A083541 this_sequence A083543 A083544 A083545`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), May 21 2003`

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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.

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