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A131382
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Minimal number m such that Sum_digits(n*m)=n.
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5
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1, 1, 1, 1, 1, 1, 1, 1, 1, 19, 19, 4, 19, 19, 13, 28, 28, 11, 46, 199, 19, 109, 73, 37, 199, 73, 37, 271, 172, 1333, 289, 559, 1303, 847, 1657, 833, 1027, 1576, 1282, 17497, 4339, 2119, 2323, 10909, 11111, 12826, 14617, 14581, 16102, 199999, 17449, 38269
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,10
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LINKS
| T. D. Noe, Table of n, a(n) for n=1..90
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EXAMPLE
| n=23 --> a=73 because 23*73 = 1679 and 1+6+7+9=23.
n=34 --> a=847 because 34*847 = 28798 and 2+8+7+9+8=34.
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MAPLE
| P:=proc(n) local i, j, k, w; for i from 1 by 1 to n do for j from 1 to n do w:=0; k:=i*j; while k>0 do w:=w+k-(trunc(k/10)*10); k:=trunc(k/10); od; if i=w then print(j); break; fi; od; od; end: P(1000000);
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CROSSREFS
| Cf. A002998
Sequence in context: A004460 A082126 A176411 * A057430 A010858 A168525
Adjacent sequences: A131379 A131380 A131381 * A131383 A131384 A131385
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KEYWORD
| base,nonn
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AUTHOR
| Paolo P. Lava & Giorgio Balzarotti (paoloplava(AT)gmail.com), Jul 09 2007
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