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Search: id:A131545
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| A131545 |
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Least power of 3 having exactly n consecutive 8's in its decimal representation. |
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+0
1
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| 4, 23, 32, 215, 1261, 538, 4797, 17612, 32311, 375482
(list; graph; listen)
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OFFSET
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1,1
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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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Sequence in context: A037142 A115989 A016485 this_sequence A030716 A106684 A030653
Adjacent sequences: A131542 A131543 A131544 this_sequence 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 (guptass(AT)rediffmail.com), Aug 26 2007
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