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 A015931 Positive integers n such that 2^n (mod n) == 2^9 (mod n). 9
 1, 2, 3, 4, 5, 8, 9, 16, 17, 21, 27, 32, 45, 63, 64, 99, 105, 117, 124, 128, 153, 171, 189, 207, 254, 256, 261, 273, 279, 333, 369, 387, 423, 429, 477, 512, 513, 531, 549, 585, 603, 639, 657, 711, 747, 801, 873, 909, 927, 945, 963, 981, 1017, 1143, 1179, 1197, 1209, 1233, 1251, 1341, 1359, 1365, 1413, 1467, 1472, 1503, 1504, 1557, 1611, 1629, 1665, 1719, 1737, 1773, 1785, 1791, 1899, 1971 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS For all m, 2^A128123(m)-1 belongs to this sequence. LINKS Seiichi Manyama, Table of n, a(n) for n = 1..10000 OEIS Wiki, 2^n mod n MATHEMATICA Select[Range[2000], PowerMod[2, 9, #]==PowerMod[2, #, #]&] (* Harvey P. Dale, Apr 01 2017 *) PROG (PARI) isok(n) = Mod(2, n)^n == 2^9; \\ Michel Marcus, Sep 23 2016 CROSSREFS Contains A208157 as a subsequence. The odd terms form A276970. Sequence in context: A264886 A287117 A286431 * A330400 A306044 A263581 Adjacent sequences:  A015928 A015929 A015930 * A015932 A015933 A015934 KEYWORD nonn AUTHOR EXTENSIONS Edited by Max Alekseyev, Jul 30 2011 Definition clarified by Harvey P. Dale, Apr 01 2017 STATUS approved

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Last modified August 1 22:01 EDT 2021. Contains 346408 sequences. (Running on oeis4.)