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A192109
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Numbers k that divide 2^(k-1) - 2.
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3
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1, 2, 6, 10, 14, 22, 26, 30, 34, 38, 46, 58, 62, 74, 82, 86, 94, 106, 118, 122, 134, 142, 146, 158, 166, 170, 178, 182, 194, 202, 206, 214, 218, 226, 254, 262, 274, 278, 298, 302, 314, 326, 334, 346, 358, 362, 382, 386, 394, 398, 422, 446, 454, 458, 466, 478, 482, 502, 514, 526, 538, 542, 554, 562, 566, 586, 614, 622, 626
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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Join[{1, 2}, Select[Range[700], PowerMod[2, #-1, #]==2&]] (* Harvey P. Dale, May 15 2015 *)
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PROG
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(Haskell)
import Data.List (elemIndices)
a192109 n = a192109_list !! (n-1)
a192109_list = map (+ 1) $ elemIndices 0 $ zipWith mod a000918_list [1..]
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CROSSREFS
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Subsequence of A015921, consisting of the terms that are not multiples of 4.
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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