A217177 a(n) is the number of digits in the decimal representation of the smallest power of n that contains two consecutive identical digits.
5, 6, 5, 8, 4, 6, 6, 6, 3, 2, 3, 11, 4, 3, 5, 9, 7, 7, 3, 3, 2, 9, 6, 9, 8, 6, 12, 8, 3, 9, 8, 2, 4, 4, 5, 11, 4, 7, 4, 9, 5, 7, 2, 5, 4, 4, 6, 6, 4, 12, 7, 6, 11, 2, 7, 8, 4, 8, 4, 6, 4, 6, 6, 4, 2, 4, 6, 8, 4, 6, 14, 12, 6, 12, 4, 2, 6, 8, 4, 6, 6, 4, 10, 4, 8, 12, 2
Offset: 2
Links
- V. Raman, Table of n, a(n) for n = 2..10000
Programs
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Mathematica
Table[k = 1; While[d = IntegerDigits[n^k]; ! MemberQ[Differences[d], 0], k++];Length[d], {n, 2, 100}] (* T. D. Noe, Oct 03 2012 *)
Comments