id:A051533 - OEIS Search Results

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Numbers which are the sum of two positive triangular numbers.

+0
11

2, 4, 6, 7, 9, 11, 12, 13, 16, 18, 20, 21, 22, 24, 25, 27, 29, 30, 31, 34, 36, 37, 38, 39, 42, 43, 46, 48, 49, 51, 55, 56, 57, 58, 60, 61, 64, 65, 66, 67, 69, 70, 72, 73, 76, 79, 81, 83, 84, 87, 88, 90, 91, 92, 93, 94, 97, 99, 100, 101, 102, 106, 108 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..1000` `Eric Weisstein's World of Mathematics, Source`
	EXAMPLE	`666 is in the sequence because we can write 666 = 435 + 231 = binomial(22,2)+binomial(30,2).`
	CROSSREFS	`Cf. A000217, A020756 (sums of two triangular numbers), A001481 (sums of two squares), A007294, A051611.` `Sequence in context: A022301 A050099 A052056 this_sequence A039009 A032793 A083088` `Adjacent sequences: A051530 A051531 A051532 this_sequence A051534 A051535 A051536`
	KEYWORD	`easy,nonn,nice`
	AUTHOR	`Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de)`

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Last modified September 7 15:23 EDT 2008. Contains 143483 sequences.

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