id:A053568 - OEIS Search Results

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Totients of non-totient numbers.

+0
1

2, 4, 6, 6, 10, 12, 6, 8, 16, 18, 12, 22, 20, 12, 18, 28, 30, 20, 16, 24, 36, 18, 24, 40, 42, 24, 46, 42, 20, 32, 52, 40, 36, 58, 60, 30, 36, 48, 66, 32, 44, 70, 72, 36, 40, 36, 60, 78, 54, 82, 64, 42, 56, 88, 24, 72, 60, 46, 72, 96, 42, 60, 100, 102, 48, 106 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`See comment at analogous A053474.`
	FORMULA	`a(n)=A000010[A007617[n]]`
	EXAMPLE	`If n=19 then no number x so that Phi[x]=19,however Phi[19]=18; n=27 is also a non-totient number of which totient is also 18.`
	CROSSREFS	`Cf. A000010, A007617.` `Sequence in context: A115947 A061228 A070229 this_sequence A037225 A060685 A073353` `Adjacent sequences: A053565 A053566 A053567 this_sequence A053569 A053570 A053571`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Jan 17 2000`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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