A063665 - OEIS

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A063665

Number of ways 1/n can be written as 1/x^2+1/y^2 [with y>=x].

0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,98`
	EXAMPLE	`a(90)=1 since 1/90=1/10^2+1/30^2; a(98)=2 since 1/98=1/10^2+1/70^2=1/14^2+1/14^2.`
	CROSSREFS	`Cf. A000161, A025426, A018892, A063664.` `Sequence in context: A102683 A122840 A083919 * A072507 A130779 A130706` `Adjacent sequences: A063662 A063663 A063664 * A063666 A063667 A063668`
	KEYWORD	`nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Jul 25 2001`

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Last modified February 17 04:58 EST 2012. Contains 205985 sequences.