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Search: id:A131550
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| A131550 |
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Least power of 3 having exactly n consecutive 3's in its decimal representation. |
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+0
1
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| 1, 31, 119, 185, 511, 2341, 9671, 7721, 67449, 364579
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(3)=119 because 3^119(i.e. 599003433304810403471059943169868346577158542512617035467) is the smallest power of 3 to contain a run of 3 consecutive threes in its decimal form.
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MATHEMATICA
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a = ""; Do[ a = StringJoin[a, "3"]; b = StringJoin[a, "3"]; 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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Adjacent sequences: A131547 A131548 A131549 this_sequence A131551 A131552 A131553
Sequence in context: A044663 A142228 A010019 this_sequence A038992 A068021 A131992
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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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