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Search: id:A131535
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| A131535 |
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Least power of 2 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)=42 because 2^42(i.e. 4398046511104) is the smallest power of 2 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[2^k], a] == {} || StringPosition[ ToString[2^k], b] != {}, k++ ]; Print[k], {n, 1, 10} ]
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CROSSREFS
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Adjacent sequences: A131532 A131533 A131534 this_sequence A131536 A131537 A131538
Sequence in context: A049475 A080271 A104292 this_sequence A077329 A061473 A091104
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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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