id:A067720 - OEIS Search Results

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Numbers n such that phi(n^2+1)=n*phi(n+1).

+0
2

1, 2, 4, 6, 8, 10, 16, 36, 40, 66, 126, 130, 150, 156, 180, 210, 240, 250, 256, 270, 280, 306, 396, 400, 420, 430, 466, 490, 556, 570, 576, 646, 690, 700, 750, 760, 826, 906, 910, 936, 946, 966, 1060, 1096, 1150, 1276, 1290, 1306, 1320, 1366, 1566, 1570 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n)+1 is prime except for a(5)=8` `Superset of A070689. Is a(5)=8 the only additional value? - Ralf Stephan, Feb 11 2004`
	CROSSREFS	`Sequence in context: A057195 A088007 A088008 this_sequence A078106 A111082 A100433` `Adjacent sequences: A067717 A067718 A067719 this_sequence A067721 A067722 A067723`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 05 2002`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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