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Search: id:A135043
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| A135043 |
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Possible sums of digits of cubes. |
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+0
1
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| 1, 8, 9, 10, 17, 18, 19, 26, 27, 28, 35, 36, 37, 44, 45, 46, 53, 54, 55, 62, 63, 64, 71, 72, 73, 80, 81, 82, 89, 90, 91, 98, 99, 100, 107, 108, 109, 116, 117, 118, 125, 126, 127, 134, 135, 136
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Minimal n's with corresponding sum-of-digits(n^3) are: 1, 2, 3, 4, 14, 9, 13, 26, 27, 19, 53, 66, 76, 92, 132, 157, 353, 423, 559, 842, 927, 1192, 2129, 3846, 1966, 4289, 5826, 8782, 12116, 16299, 19129, 12599, 41013, 30355, 63413, 66942, 99829, 138899, 265413, 215083, 341075, 506499, 573859
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FORMULA
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a(1)=1, a(2)=8, a(3)=9, a(4)=10, a(n>4)=a(n-3)+9.
O.g.f.: 3/(-1+x)^2+3/(-1+x)-2*x/(x^2+x+1) . a(n) = A008585(n+1)-3+(-1)^n*A130772(n-1) . - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 14 2008
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CROSSREFS
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Adjacent sequences: A135040 A135041 A135042 this_sequence A135044 A135045 A135046
Sequence in context: A091417 A069237 A070480 this_sequence A054966 A130881 A048020
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KEYWORD
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nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Feb 11 2008
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