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A131551
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Least power of 3 having exactly n consecutive 2's in its decimal representation.
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1
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OFFSET
| 1,1
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EXAMPLE
| a(3)=148 because 3^148(i.e. 41109831670569663658300086939077404909608122265524774868353822811305361) is the smallest power of 3 to contain a run of 3 consecutive twos in its decimal form.
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MATHEMATICA
| a = ""; Do[ a = StringJoin[a, "2"]; b = StringJoin[a, "2"]; k = 1; While[ StringPosition[ ToString[3^k], a] == {} || StringPosition[ ToString[3^k], b] != {}, k++ ]; Print[k], {n, 1, 10} ]
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CROSSREFS
| Sequence in context: A080833 A073516 A005258 * A074546 A054316 A006289
Adjacent sequences: A131548 A131549 A131550 * A131552 A131553 A131554
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KEYWORD
| more,nonn,base
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AUTHOR
| Shyam Sunder Gupta (guptass(AT)rediffmail.com), Aug 26 2007
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