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A050726 Decimal expansion of 5^n contains no pair of consecutive equal digits (probably finite). 1
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 14, 15, 16, 17, 18, 19, 20, 21, 22, 27, 28, 29, 32 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

No further terms up to 3000. [From Harvey P. Dale, May 11 2011]

No further terms up to 80000. - Ivan N. Ianakiev, Aug 31 2019

LINKS

Table of n, a(n) for n=0..23.

EXAMPLE

5^32 = 23283064365386962890625.

MATHEMATICA

Select[Range[0, 3000], And@@(First[#]!=Last[#]&/@Partition[ IntegerDigits[ 5^#], 2, 1])&] (* Harvey P. Dale, May 11 2011 *)

Select[Range[0, 40], SequenceCount[IntegerDigits[5^#], {x_, x_}]==0&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jun 12 2020 *)

CROSSREFS

Cf. A008839, A046263, A046271.

Sequence in context: A263443 A266352 A247144 * A108155 A134932 A134933

Adjacent sequences:  A050723 A050724 A050725 * A050727 A050728 A050729

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Sep 15 1999

STATUS

approved

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Last modified May 22 09:12 EDT 2022. Contains 353941 sequences. (Running on oeis4.)