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A147825
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Minimum number k for which the digital sum of k*n is 5*n.
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3
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0, 5, 14, 23, 122, 599, 833, 1427, 9986, 11111, 599999, 590909, 749999, 3769223, 13571357, 53333333, 187499993, 294117647, 1111111111, 3684210521, 149999999999, 37619047619, 590909090909, 391304347826, 2916666666662, 23999999999999, 23076923076923, 37037037037037
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OFFSET
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0,2
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LINKS
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MAPLE
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P:=proc(i) local j, k, n, ok, w; for n from 0 by 1 to i do j:=-1; ok:=1; while ok=1 do j:=j+1; w:=0; k:=n*j; while k>0 do w:=w+k-(trunc(k/10)*10); k:=trunc(k/10); od; if w=5*n then ok:=0; print(j); fi; od; od; end: P(100);
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PROG
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(PARI) a(n) = {my(k = 0); while (sumdigits(k*n) != 5*n, k++); k; }; \\ Michel Marcus, Mar 21 2016
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CROSSREFS
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KEYWORD
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easy,nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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