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Search: id:A131537
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| A131537 |
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Least power of 2 having exactly n consecutive 3'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)=83 because 2^83(i.e. 9671406556917033397649408) is the smallest power of 2 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[2^k], a] == {} || StringPosition[ ToString[2^k], b] != {}, k++ ]; Print[k], {n, 1, 9} ]
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CROSSREFS
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Sequence in context: A056374 A062989 A122679 this_sequence A051229 A058919 A018212
Adjacent sequences: A131534 A131535 A131536 this_sequence A131538 A131539 A131540
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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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