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 A069530 Smallest multiple of n with digit sum = 11, or 0 if no such number exists. 13
 29, 38, 0, 56, 65, 0, 56, 56, 0, 290, 209, 0, 65, 56, 0, 128, 119, 0, 38, 380, 0, 308, 92, 0, 425, 182, 0, 56, 29, 0, 155, 128, 0, 272, 245, 0, 74, 38, 0, 560, 164, 0, 344, 308, 0, 92, 47, 0, 245, 650, 0, 416, 371, 0, 605, 56, 0, 290, 236, 0, 1037, 434, 0, 128, 65, 0, 335 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS FORMULA a(3k) = 0 for k = 1, 2, 3, .... a(n) = n*A088400(n). - R. J. Mathar, Aug 06 2019 MAPLE A069530 := proc(n)     local m ;     if modp(n, 3) = 0 then          0 ;     else         for m from 1 do             if digsum(m*n) = 11 then                 return m*n ;             end if;         end do:     end if; end proc: seq(A069530(n), n=1..70) ; # R. J. Mathar, Aug 06 2019 PROG (PARI) sod(n) = {digs = digits(n); return (sum(i=1, #digs, digs[i])); } a(n) = {if (n % 3 == 0, return (0)); k = 1; while (sod(k*n) != 11, k++); k; } \\ Michel Marcus, Sep 14 2013 CROSSREFS Cf. A166311, A069521, A069522, A069523, A069524, A069525, A069526, A069527, A069528, A069529. Sequence in context: A333422 A108272 A121999 * A259032 A087144 A114616 Adjacent sequences:  A069527 A069528 A069529 * A069531 A069532 A069533 KEYWORD base,nonn AUTHOR Amarnath Murthy, Apr 01 2002 EXTENSIONS More terms from Sascha Kurz, Apr 08 2002 STATUS approved

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Last modified September 21 19:57 EDT 2020. Contains 337273 sequences. (Running on oeis4.)