A001983 - OEIS

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A001983

Numbers which are the sum of 2 distinct squares: of form x^2+y^2 with 0<=x<y.

1, 4, 5, 9, 10, 13, 16, 17, 20, 25, 26, 29, 34, 36, 37, 40, 41, 45, 49, 50, 52, 53, 58, 61, 64, 65, 68, 73, 74, 80, 81, 82, 85, 89, 90, 97, 100, 101, 104, 106, 109, 113, 116, 117, 121, 122, 125, 130, 136, 137, 144, 145, 146, 148, 149, 153, 157, 160, 164 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..1000` `Index entries for sequences related to sums of squares` `G. Xiao, Two squares`
	MATHEMATICA	`upto=200; max=Floor[Sqrt[upto]]; s=Total/@((Subsets[Range[0, max], {2}])^2); Union[Select[s, #<=upto&]] (* From Harvey P. Dale, Apr 01 2011 *)`
	CROSSREFS	`Sequence in context: A008935 A003995 A064473 * A143575 A047208 A177887` `Adjacent sequences: A001980 A001981 A001982 * A001984 A001985 A001986`
	KEYWORD	`nonn,easy,nice`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 17 00:09 EST 2012. Contains 205978 sequences.