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 A063555 Smallest k such that 3^k has exactly n 0's in its decimal representation. 12
 0, 10, 22, 21, 35, 57, 55, 54, 107, 137, 126, 170, 188, 159, 191, 225, 259, 297, 262, 253, 340, 296, 380, 369, 403, 395, 383, 407, 429, 514, 446, 486, 431, 545, 589, 510, 546, 542, 666, 733, 540, 621, 709, 715, 549, 694, 804, 820, 847, 865, 710 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Robert Israel, Table of n, a(n) for n = 0..2000 MAPLE N:= 100: # to get a(0)..a(N) A:= Array(0..N, -1): p:= 1: A[0]:= 0: count:= 1: for k from 1 while count <= N do   p:= 3*p;   m:= numboccur(0, convert(p, base, 10));   if m <= N and A[m] < 0 then A[m]:= k; count:= count+1 fi od: seq(A[i], i=0..N); # Robert Israel, Dec 21 2016 MATHEMATICA a = {}; Do[k = 1; While[ Count[ IntegerDigits[3^k], 0] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a Module[{l3=Table[{n, DigitCount[3^n, 10, 0]}, {n, 900}]}, Transpose[Table[ SelectFirst[ l3, #[[2]]==i&], {i, 0, 50}]][[1]]] (* Harvey P. Dale, Dec 08 2014 *) PROG (PARI) A063555(n)=for(k=0, oo, #select(d->!d, digits(3^k))==n&&return(k)) \\ M. F. Hasler, Jun 14 2018 CROSSREFS Cf. A000244. Cf. A031146 (analog for 2^k), A063575 (analog for 4^k). Sequence in context: A226789 A110367 A104865 * A228010 A303745 A303746 Adjacent sequences:  A063552 A063553 A063554 * A063556 A063557 A063558 KEYWORD base,nonn AUTHOR Robert G. Wilson v, Aug 10 2001 EXTENSIONS a(0) corrected by Zak Seidov, Jun 14 2018 STATUS approved

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Last modified December 11 07:47 EST 2019. Contains 329914 sequences. (Running on oeis4.)