id:A160053 - OEIS Search Results

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Numbers n with property that n(n+1)/2 is sum of two nonnegative squares.

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0, 1, 4, 8, 9, 16, 17, 25, 36, 40, 49, 52, 64, 72, 73, 80, 81, 89, 97, 100, 116, 121, 136, 144, 145, 148, 169, 180, 193, 196, 225, 232, 233, 241, 244, 256, 260, 288, 289, 292, 305, 313, 324, 337, 360, 361, 369, 388, 400, 404, 409, 424, 441, 449, 457, 481, 484 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`A000217(n) is term in A001481 and in A073613.`
	MATHEMATICA	`(M6) A1 = {}; Do[If[SquaresR[2, n (n + 1)/2] > 0, AppendTo[A1, n]], {n, 0, 1500}]; A1`
	CROSSREFS	`A000217 Triangular numbers. A000404 Numbers that are the sum of 2 nonzero squares. A001481 Numbers that are the sum of 2 nonnegative squares. A073613 Triangular numbers which are the sum of two nonnegative squares.` `Sequence in context: A153034 A106840 A140612 this_sequence A034023 A086368 A034024` `Adjacent sequences: A160050 A160051 A160052 this_sequence A160054 A160055 A160056`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), May 01 2009`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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