A053443 - OEIS

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A053443

x^2 + y^2 does not take on all possible values mod n.

4, 8, 9, 12, 16, 18, 20, 24, 27, 28, 32, 36, 40, 44, 45, 48, 49, 52, 54, 56, 60, 63, 64, 68, 72, 76, 80, 81, 84, 88, 90, 92, 96, 98, 99, 100, 104, 108, 112, 116, 117, 120, 121, 124, 126, 128, 132, 135, 136, 140, 144, 147, 148, 152, 153, 156, 160, 162, 164, 168, 171 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Sequence gives values of n such there is a solution 1<x<n to x^2+n^2=n mod(n) - Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 04 2002`
	FORMULA	`n divisible by p^2 where p = 2 or prime p == 3 (mod 4).`
	CROSSREFS	`A053444.` `Sequence in context: A013929 A162966 A034043 * A048098 A122145 A057109` `Adjacent sequences: A053440 A053441 A053442 * A053444 A053445 A053446`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

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Last modified February 14 11:36 EST 2012. Contains 205623 sequences.