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A063590 Smallest k such that 5^k has exactly n 5's in its decimal representation. 0

%I #6 Jun 26 2018 19:24:22

%S 1,6,14,27,30,41,65,66,54,83,73,109,102,112,118,106,187,159,175,204,

%T 209,174,222,278,234,327,266,300,369,318,310,339,350,377,301,357,426,

%U 411,446,421,434,452,490,525,494,521,554,543,514,503

%N Smallest k such that 5^k has exactly n 5's in its decimal representation.

%t a = {}; Do[k = 1; While[ Count[ IntegerDigits[5^k], 5] != n, k++ ]; a = Append[a, k], {n, 1, 50} ]; a

%K base,nonn

%O 1,2

%A _Robert G. Wilson v_, Aug 10 2001

%E Name corrected by _Jon E. Schoenfield_, Jun 26 2018

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Last modified March 29 00:26 EDT 2024. Contains 371264 sequences. (Running on oeis4.)