id:A062803 - OEIS Search Results

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Number of non-congruent solutions to x^2 - y^2 = 0 mod n.

+0
5

1, 2, 5, 8, 9, 10, 13, 24, 21, 18, 21, 40, 25, 26, 45, 64, 33, 42, 37, 72, 65, 42, 45, 120, 65, 50, 81, 104, 57, 90, 61, 160, 105, 66, 117, 168, 73, 74, 125, 216, 81, 130, 85, 168, 189, 90, 93, 320, 133, 130, 165, 200, 105, 162, 189, 312, 185, 114, 117, 360, 121, 122, 273 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n) is multiplicative and, for an odd prime p, a(p) = 2*p - 1.`
	FORMULA	`Multiplicative with a(2^e)=e2^e and a(p^e)=((p-1)e+p)*p^(e-1) for an odd prime p. - Vladeta Jovovic (vladeta(AT)eunet.rs), Sep 22 2003`
	CROSSREFS	`Cf. A086933.` `Sequence in context: A085254 A068537 A047620 this_sequence A153275 A161154 A108968` `Adjacent sequences: A062800 A062801 A062802 this_sequence A062804 A062805 A062806`
	KEYWORD	`nonn,mult`
	AUTHOR	`Ahmed Fares (ahmedfares(AT)my-deja.com), Jul 19 2001`
	EXTENSIONS	`More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Sep 22 2003`

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

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