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%I #6 Jun 26 2018 19:16:40
%S 1,5,17,25,32,48,35,90,84,81,128,101,140,120,159,145,179,154,181,104,
%T 224,234,226,246,261,228,315,323,316,320,259,303,359,325,377,317,369,
%U 415,457,439,476,473,493,470,513,548,508,472,529,533,601
%N Smallest k such that 5^k has exactly n 3's in its decimal representation.
%t a = {}; Do[k = 1; While[ Count[ IntegerDigits[5^k], 3] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a
%K base,nonn
%O 0,2
%A _Robert G. Wilson v_, Aug 10 2001
%E Name corrected by _Jon E. Schoenfield_, Jun 26 2018
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