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A131545
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Least k such that 3^k has exactly n consecutive 8's in its decimal representation.
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9
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4, 23, 32, 215, 1261, 538, 4797, 17612, 32311, 375482, 512959, 1847532, 8295710, 8885853, 80798025
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OFFSET
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1,1
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COMMENTS
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No more terms < 10^8. - Bert Dobbelaere, Mar 20 2019
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LINKS
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Table of n, a(n) for n=1..15.
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EXAMPLE
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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.
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MATHEMATICA
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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} ]
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CROSSREFS
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Cf. A195269, A131552, A131551, A131550, A131549, A131548, A131547, A131546, A131544.
Sequence in context: A258203 A293698 A160613 * A030716 A169599 A106684
Adjacent sequences: A131542 A131543 A131544 * A131546 A131547 A131548
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KEYWORD
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more,nonn,base
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AUTHOR
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Shyam Sunder Gupta, Aug 26 2007
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EXTENSIONS
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a(11)-a(14) from Lars Blomberg, Feb 02 2013
a(15) from Bert Dobbelaere, Mar 20 2019
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STATUS
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approved
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