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Search: id:A071817
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| A071817 |
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Number of 3-digit numbers that add up to n. |
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+0
5
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| 1, 3, 6, 10, 15, 21, 28, 36, 45, 54, 61, 66, 69, 70, 69, 66, 61, 54, 45, 36, 28, 21, 15, 10, 6, 3, 1
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(4)=10 because there are 10 different 3-digit numbers whose sum-of-digits is 4 (103, 112, 121, 130, 202, 211, 220, 301, 310, 400, which are the 3-digit elements of A052218)
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MAPLE
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for i from 1 to 9*3 do a[i] := 0:od:for i from 100 to 999 dob := convert(i, base, 10): s := sum(b[j], j=1..nops(b)):a[s] := a[s]+1:od:seq(a[j], j=1..3*9);
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CROSSREFS
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Cf. A071816.
Sequence in context: A037123 A062918 A113168 this_sequence A033442 A105335 A130489
Adjacent sequences: A071814 A071815 A071816 this_sequence A071818 A071819 A071820
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KEYWORD
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fini,full,nonn
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AUTHOR
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Graeme McRae (graeme(AT)mcraeclan.com), Jun 07 2002
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EXTENSIONS
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Corrected and extended by Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Feb 07 2003
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