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 A116622 Positive integers n such that 13^n == 2 (mod n). 13
 1, 11, 140711, 863101, 1856455, 115602923, 566411084209, 706836043419179 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS No other terms below 10^16. - Max Alekseyev, Nov 02 2018 LINKS MATHEMATICA Select[Range[1, 500000], Mod[13^#, #] == 2 &] (* G. C. Greubel, Nov 19 2017 *) PROG (PARI) isok(n) = Mod(13, n)^n == 2; \\ Michel Marcus, Nov 19 2017 CROSSREFS Cf. A116609. Solutions to b^n == 2 (mod n): A015919 (b=2), A276671 (b=3), A130421 (b=4), A124246 (b=5), A277401 (b=7). Solutions to 13^n == k (mod n): A001022 (k=0), A015963 (k=-1), A116621 (k=1), this sequence (k=2), A116629 (k=3), A116630 (k=4), A116611 (k=5), A116631 (k=6), A116632 (k=7), A295532 (k=8), A116636 (k=9), A116620 (k=10), A116638 (k=11), A116639  (k=15) Sequence in context: A111478 A300196 A055311 * A013794 A022009 A201249 Adjacent sequences:  A116619 A116620 A116621 * A116623 A116624 A116625 KEYWORD more,nonn AUTHOR Zak Seidov, Feb 19 2006 EXTENSIONS One more term from Ryan Propper, Jun 11 2006 Term a(1)=1 is prepended and a(7)-a(8) are added by Max Alekseyev, Jun 29 2011 STATUS approved

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Last modified February 20 07:28 EST 2020. Contains 332067 sequences. (Running on oeis4.)