id:A069952 - OEIS Search Results

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Numbers n such that (n+1)*phi(n) is a perfect square.

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8, 26, 44, 48, 63, 485, 636, 866, 960, 1034, 1351, 1407, 1520, 3970, 4912, 7580, 8749, 12935, 14282, 19601, 20824, 23103, 36480, 43680, 44505, 48599, 49004, 58620, 63000, 72896, 75842, 85696, 90167, 97469, 108240, 122316, 127007, 134135 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`If k>1 kphi(k) is not a perfect square. If p is prime (p-1)phi(p) is a perfect square.`
	CROSSREFS	`Sequence in context: A029617 A120743 A063560 this_sequence A031085 A031307 A122854` `Adjacent sequences: A069949 A069950 A069951 this_sequence A069953 A069954 A069955`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 27 2002`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

AT&T Labs Research