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A217160 a(n) is the least value of k such that the decimal expansion of n^k contains five consecutive identical digits. 3
220, 274, 110, 125, 226, 172, 105, 137, 5, 156, 40, 227, 196, 216, 55, 235, 78, 115, 5, 104, 133, 187, 126, 93, 115, 110, 21, 163, 5, 40, 44, 159, 104, 110, 113, 20, 200, 205, 5, 119, 142, 116, 90, 145, 156, 136, 37, 86, 5, 37, 62, 119, 85, 91, 107, 142, 40 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

V. Raman, Table of n, a(n) for n = 2..10000

MATHEMATICA

Table[k = 1; While[! MemberQ[Partition[Differences[IntegerDigits[n^k]], 4, 1], {0, 0, 0, 0}], k++]; k, {n, 2, 100}] (* T. D. Noe, Oct 01 2012 *)

CROSSREFS

Cf. A045875, A215727, A215728, A215729, A215730, A215731.

Sequence in context: A157645 A157673 A064477 * A203777 A274116 A121507

Adjacent sequences:  A217157 A217158 A217159 * A217161 A217162 A217163

KEYWORD

nonn,base

AUTHOR

V. Raman, Sep 27 2012

STATUS

approved

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Last modified August 19 18:51 EDT 2019. Contains 326133 sequences. (Running on oeis4.)