id:A071181 - OEIS Search Results

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Number of k such that phi(k) divides phi(n).

+0
1

2, 2, 5, 5, 9, 5, 9, 9, 9, 9, 7, 9, 19, 9, 14, 14, 20, 9, 13, 14, 19, 7, 7, 14, 16, 19, 13, 19, 11, 14, 13, 20, 16, 20, 34, 19, 31, 13, 34, 20, 30, 19, 13, 16, 34, 7, 7, 20, 13, 16, 27, 34, 11, 13, 30, 34, 31, 11, 7, 20, 37, 13, 31, 27, 51, 16, 13, 27, 14, 34, 9, 34, 63, 31, 30, 31 (list; graph; listen)

	OFFSET	`1,1`
	PROGRAM	`(PARI) for(n=1, 100, print1(sum(i=1, 1000, if(eulerphi(n)%eulerphi(i), 0, 1)), ", "))`
	CROSSREFS	`Sequence in context: A073707 A091609 A062405 this_sequence A079964 A103891 A005294` `Adjacent sequences: A071178 A071179 A071180 this_sequence A071182 A071183 A071184`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Jun 10 2002`

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.

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