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Search: id:A131540
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| A131540 |
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Least power of 2 having exactly n consecutive 6's in its decimal representation. |
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+0
1
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| 4, 46, 157, 222, 220, 2269, 11019, 18842, 192918, 192916
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(3)=157 because 2^157(i.e. 182687704666362864775460604089535377456991567872) is the smallest power of 2 to contain a run of 3 consecutive sixes in its decimal form.
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MATHEMATICA
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a = ""; Do[ a = StringJoin[a, "6"]; b = StringJoin[a, "6"]; 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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Sequence in context: A119729 A134110 A119046 this_sequence A132932 A097952 A097643
Adjacent sequences: A131537 A131538 A131539 this_sequence A131541 A131542 A131543
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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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