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A071817 Number of 3-digit numbers that add up to n. 4
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; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..27.

EXAMPLE

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)

MAPLE

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);

CROSSREFS

Cf. A071816.

Sequence in context: A037123 A062918 A113168 * A033442 A105335 A130489

Adjacent sequences:  A071814 A071815 A071816 * A071818 A071819 A071820

KEYWORD

fini,full,nonn,base

AUTHOR

Graeme McRae, Jun 07 2002

EXTENSIONS

Corrected and extended by Sascha Kurz, Feb 07 2003

STATUS

approved

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Last modified November 23 19:50 EST 2014. Contains 249865 sequences.