id:A066820 - OEIS Search Results

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Integers of the form phi(n^2+1)/n.

+0
4

1, 2, 4, 6, 6, 10, 14, 16, 20, 24, 26, 25, 36, 40, 48, 54, 56, 60, 66, 74, 84, 90, 94, 110, 116, 120, 124, 126, 98, 130, 134, 146, 150, 156, 160, 170, 176, 180, 184, 150, 204, 206, 210, 192, 224, 230, 236, 240, 250, 256, 264, 270, 280, 284, 300, 306, 314, 326 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`If k^2+1 is prime phi(k^2+1)/k=k, hence A005574(n) is included in the sequence.For odd values see A066852.`
	CROSSREFS	`Cf. A066852.` `Sequence in context: A037225 A060685 A073353 this_sequence A141677 A087459 A123258` `Adjacent sequences: A066817 A066818 A066819 this_sequence A066821 A066822 A066823`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 19 2002`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

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