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Search: id:A131552
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| A131552 |
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Least power of 3 having exactly n consecutive 1's in its decimal representation. |
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+0
1
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OFFSET
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1,1
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EXAMPLE
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a(3)=93 because 3^93(i.e. 235655016338368235499067731945871638181119123) is the smallest power of 3 to contain a run of 3 consecutive ones in its decimal form.
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MATHEMATICA
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a = ""; Do[ a = StringJoin[a, "1"]; b = StringJoin[a, "1"]; 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: A131549 A131550 A131551 this_sequence A131553 A131554 A131555
Sequence in context: A004253 A151253 A121179 this_sequence A122369 A005978 A083065
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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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