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Search: id:A131544
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| A131544 |
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Least power of 3 having exactly n consecutive 9's in its decimal representation. |
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+0
1
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| 2, 34, 35, 276, 1520, 2342, 8882, 32313, 164065, 265693
(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)=35 because 3^35(i.e. 50031545098999707) is the smallest power of 3 to contain a run of 3 consecutive nines in its decimal form.
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MATHEMATICA
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a = ""; Do[ a = StringJoin[a, "9"]; b = StringJoin[a, "9"]; 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: A112980 A109336 A098869 this_sequence A123284 A123606 A062864
Adjacent sequences: A131541 A131542 A131543 this_sequence A131545 A131546 A131547
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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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