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 A116639 Numbers n such that 13^n == 15 (mod n). 13
 1, 2, 14, 22, 1582, 11266, 52766, 76202, 100562, 494371, 641141, 1698494, 66593158, 469296521, 10917186079, 12062558662, 4928050067287, 5315948729617, 29841213777637, 113215787397262, 778590786358582, 787324867879046 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS No other terms below 10^15. Some large terms: 6991413003775539262, 2360895769139218729155198091. - Max Alekseyev, Oct 15 2016 LINKS MATHEMATICA Select[Range[25000000], PowerMod[13, #, # ]==15&] (* Harvey P. Dale, Feb 03 2009 *) CROSSREFS Cf. A116609, A116611, A116620, A116621, A116622, A116629, A116630, A116631, A116632, A116636, A116638. Sequence in context: A247035 A069512 A328217 * A220274 A036433 A172048 Adjacent sequences:  A116636 A116637 A116638 * A116640 A116641 A116642 KEYWORD nonn AUTHOR Zak Seidov, Feb 19 2006 EXTENSIONS One more term from Harvey P. Dale, Feb 03 2009 Edited by Max Alekseyev, Sep 19 2009 a(14)-a(22) from Max Alekseyev, May 04 2010, Apr 29 2014, Oct 15 2016 STATUS approved

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Last modified September 27 08:39 EDT 2021. Contains 347689 sequences. (Running on oeis4.)