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Search: id:A131547
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| A131547 |
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Least power of 3 having exactly n consecutive 6's in its decimal representation. |
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+0
1
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| 8, 33, 34, 275, 1385, 539, 8881, 22792, 90785, 107188
(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)=34 because 3^34(i.e. 16677181699666569) is the smallest power of 3 to contain a run of 3 consecutive sixes in its decimal form.
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MATHEMATICA
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a = ""; Do[ a = StringJoin[a, "6"]; b = StringJoin[a, "6"]; 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: A139306 A079271 A031445 this_sequence A044085 A107291 A044466
Adjacent sequences: A131544 A131545 A131546 this_sequence A131548 A131549 A131550
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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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