id:A055264 - OEIS Search Results

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Possible values of A055263; numbers equal to 0, 1, 3 or 6 modulo 9.

+0
3

0, 1, 3, 6, 9, 10, 12, 15, 18, 19, 21, 24, 27, 28, 30, 33, 36, 37, 39, 42, 45, 46, 48, 51, 54, 55, 57, 60, 63, 64, 66, 69, 72, 73, 75, 78, 81, 82, 84, 87, 90, 91, 93, 96, 99, 100, 102, 105, 108, 109, 111, 114, 117, 118, 120, 123, 126, 127, 129, 132, 135, 136, 138, 141 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`The terms are the possible digit sums of a triangular number. - Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jan 09 2002`
	FORMULA	`a(n) =a(n-4)+9 =9floor[n/4]+[n mod 4](1+[n mod 4])/2` `G.f.: x(1+2x+3x^2+3x^3)/((1-x)^2(1+x)(1+x^2)). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 30 2008]`
	CROSSREFS	`Cf. A055263.` `Sequence in context: A022304 A055632 A133006 this_sequence A113502 A061904 A111359` `Adjacent sequences: A055261 A055262 A055263 this_sequence A055265 A055266 A055267`
	KEYWORD	`easy,nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), May 08 2000`

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Last modified December 4 08:07 EST 2009. Contains 170310 sequences.

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