OFFSET
0,2
LINKS
Chai Wah Wu, Table of n, a(n) for n = 0..27
MAPLE
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=7*n then ok:=0; print(j); fi; od; od; end: P(100);
PROG
(PARI) a(n) = {my(k = 0); while (sumdigits(k*n) != 7*n, k++); k; }; \\ Michel Marcus, Mar 21 2016
CROSSREFS
KEYWORD
easy,nonn,base
AUTHOR
Paolo P. Lava and Giorgio Balzarotti, Nov 14 2008
EXTENSIONS
Edited by Charles R Greathouse IV, Nov 01 2009
a(9)-a(16) from Donovan Johnson, Sep 16 2012
a(17)-a(23) from Chai Wah Wu, Mar 20 2016
STATUS
approved