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A124977
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Least positive number k such that 2^k mod k = 2n+1, or 0 if no such k exists.
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8
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0, 4700063497, 19147, 25, 2228071, 262279, 95, 481, 45, 2873, 3175999, 555, 95921, 174934013, 777, 140039, 2463240427, 477, 91, 623, 2453, 55, 345119, 1131, 943, 21967, 135, 46979, 125, 3811, 23329, 155, 1064959, 245
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| A bisection of A036236: a(n) = A036236(2n+1).
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EXAMPLE
| a(3) = 25 because 2^25 = 33554432 = 7 + 25*1342177.
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CROSSREFS
| Cf. A122182, A050259, A033981, A124974, A124965, A015910, A015911.
Cf. A015910, A015911, A033981, A050259, A124965, A124974.
Sequence in context: A172726 A172797 A199631 * A128172 A050259 A175568
Adjacent sequences: A124974 A124975 A124976 * A124978 A124979 A124980
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KEYWORD
| nonn
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AUTHOR
| Zak Seidov (zakseidov(AT)yahoo.com), Nov 14 2006
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EXTENSIONS
| Edited by Max Alekseyev (maxale(AT)gmail.com), May 20 2011
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