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Search: id:A131548
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| A131548 |
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Least power of 3 having exactly n consecutive 5'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)=39 because 3^39(i.e. 4052555153018976267) is the smallest power of 3 to contain a run of 3 consecutive fives in its decimal form.
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MATHEMATICA
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a = ""; Do[ a = StringJoin[a, "5"]; b = StringJoin[a, "5"]; 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: A051760 A066215 A086213 this_sequence A063142 A032553 A031295
Adjacent sequences: A131545 A131546 A131547 this_sequence A131549 A131550 A131551
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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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