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Search: id:A124977
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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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+0
9
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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; listen)
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OFFSET
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0,2
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EXAMPLE
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a(3) = 25 because 2^25 = 33554432 = 7 + 25*1342177.
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CROSSREFS
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A bisection of A036236: a(n) = A036236(2n+1). Cf. A122182.
Cf. A050259 = numbers n such that 2^n == 3 (mod n), A033981 = 2^n (mod n) == 7, A124974 = 2^n (mod n) == 17, A124965 = Odd values of 2^n (mod n) corresponding to the n's given in A015911, A015910 = 2^n (mod n), A015911 = 2^n (mod n) is odd.
Cf. A015910, A015911, A033981, A050259, A124965, A124974.
Sequence in context: A114670 A092776 A034916 this_sequence A128172 A050259 A015384
Adjacent sequences: A124974 A124975 A124976 this_sequence A124978 A124979 A124980
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KEYWORD
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nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Nov 14 2006
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