id:A118139 - OEIS Search Results

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Numbers expressible as the sum of two triangular numbers in at least two different ways.

+0
4

6, 16, 21, 31, 36, 42, 46, 51, 55, 56, 66, 72, 76, 81, 91, 94, 106, 111, 120, 121, 123, 126, 133, 136, 141, 146, 156, 157, 171, 172, 174, 181, 186, 191, 196, 198, 210, 211, 216, 225, 226, 231, 237, 241, 246, 256, 259, 268, 276, 281, 286, 289, 291, 297, 301, 306 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`A052343(a(n)) > 1; gives A020756 together with A119345. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 15 2006`
	EXAMPLE	`a(1) = 6 = 0 + 6 = 3 +3.` `a(2) = 16 = 1 + 15 = 6 + 10.` `a(3) = 21 = 0 + 21 = 6 + 15.`
	CROSSREFS	`Cf. A020757, A000217.` `Sequence in context: A101239 A104392 A037001 this_sequence A087446 A051808 A034053` `Adjacent sequences: A118136 A118137 A118138 this_sequence A118140 A118141 A118142`
	KEYWORD	`easy,nonn`
	AUTHOR	`Greg Huber (huber(AT)alum.mit.edu), May 13 2006`
	EXTENSIONS	`More terms from Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 15 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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