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A055264
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Possible values of A055263; numbers equal to 0, 1, 3 or 6 modulo 9.
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2
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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; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| The terms are the possible digit sums of a triangular number. - Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jan 09 2002
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FORMULA
| a(n) =a(n-4)+9 =9*floor[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]
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CROSSREFS
| Cf. A055263.
Sequence in context: A176423 A055632 A133006 * A113502 A061904 A206284
Adjacent sequences: A055261 A055262 A055263 * A055265 A055266 A055267
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KEYWORD
| easy,nonn,base
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AUTHOR
| Henry Bottomley (se16(AT)btinternet.com), May 08 2000
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