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A063562 Smallest k such that 3^k has exactly n 7's in its decimal representation. 0

%I

%S 1,3,23,11,47,41,50,100,123,90,174,112,179,172,201,233,168,146,211,

%T 280,247,330,294,369,411,390,401,451,374,344,448,468,516,501,536,559,

%U 574,498,523,577,662,678,722,618,615,833,686,782,717,794,707

%N Smallest k such that 3^k has exactly n 7's in its decimal representation.

%t a = {}; Do[k = 1; While[ Count[ IntegerDigits[3^k], 7] != 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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Last modified April 14 03:53 EDT 2021. Contains 342941 sequences. (Running on oeis4.)