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A131545 Least power of 3 having exactly n consecutive 8's in its decimal representation. 1
4, 23, 32, 215, 1261, 538, 4797, 17612, 32311, 375482, 512959, 1847532, 8295710, 8885853 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

No more terms < 2*10^7.

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

a(3)=32 because 3^32(i.e. 1853020188851841) is the smallest power of 3 to contain a run of 3 consecutive eights in its decimal form.

MATHEMATICA

a = ""; Do[ a = StringJoin[a, "8"]; b = StringJoin[a, "8"]; k = 1; While[ StringPosition[ ToString[3^k], a] == {} || StringPosition[ ToString[3^k], b] != {}, k++ ]; Print[k], {n, 1, 10} ]

CROSSREFS

Sequence in context: A115989 A016485 A160613 * A030716 A106684 A239624

Adjacent sequences:  A131542 A131543 A131544 * A131546 A131547 A131548

KEYWORD

more,nonn,base

AUTHOR

Shyam Sunder Gupta, Aug 26 2007

EXTENSIONS

a(11)-a(14) from Lars Blomberg, Feb 02 2013

STATUS

approved

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Last modified December 20 03:04 EST 2014. Contains 252240 sequences.