login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A217162 a(n) is the least value of k such that the decimal expansion of n^k contains seven consecutive identical digits. 3
972, 2124, 486, 2786, 1503, 1961, 324, 1062, 7, 1323, 1938, 512, 1053, 2600, 243, 2474, 1486, 940, 7, 1085, 1068, 238, 2908, 1393, 699, 708, 704, 1566, 7, 286, 1711, 935, 2225, 1190, 1357, 692, 1182, 448, 7, 885, 1349, 815, 647, 1675, 1131, 548, 333, 1154, 7 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

V. Raman, Table of n, a(n) for n = 2..1000

MATHEMATICA

Table[k = 1; While[! MemberQ[Partition[Differences[IntegerDigits[n^k]], 6, 1], {0, 0, 0, 0, 0, 0}], k++]; k, {n, 2, 100}] (* T. D. Noe, Oct 01 2012 *)

scd[n_]:=Module[{k=1}, While[FreeQ[IntegerDigits[n^k], {___, x_, x_, x_, x_, x_, x_, x_, ___}], k++]; k]; Array[scd, 50, 2] (* Harvey P. Dale, May 23 2016 *)

CROSSREFS

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

Sequence in context: A243861 A171771 A206089 * A203375 A183359 A203030

Adjacent sequences:  A217159 A217160 A217161 * A217163 A217164 A217165

KEYWORD

nonn,base

AUTHOR

V. Raman, Sep 27 2012

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified March 27 16:36 EDT 2017. Contains 284177 sequences.