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A122182
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Least positive number k such that 2^k mod k = 2n, or 0 if no such k exists.
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2
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1, 3, 6, 10669, 9, 18, 3763, 1010, 20, 35, 2951, 42, 50, 27, 36, 49, 56, 110, 697, 578, 156, 540923, 70, 287, 104, 147, 4044, 970, 220, 59378, 119, 345, 66, 3007, 75, 1990362, 184, 190, 100, 115, 81, 162, 470, 406, 812, 6631, 105, 310, 160, 207, 322
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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lpn[n_]:=Module[{k=1}, While[PowerMod[2, k, k]!=2n, k++]; k]; Array[lpn, 60, 0] (* Harvey P. Dale, Jul 23 2012 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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