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 A240942 Numbers k that divide 2^k + 9. 4
 1, 11, 121, 323, 117283, 432091, 4132384531, 15516834659, 15941429747, 98953554491, 3272831195051, 7362974489179, 26306805687881, 33869035218491, 280980898827691 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS No other terms below 10^15. Some larger terms: 53496121130110340001650284048539458491, 136243118444105327963550175410279542214992801356720577. - Max Alekseyev, Sep 29 2016 LINKS OEIS Wiki, 2^n mod n EXAMPLE 2^11 + 9 = 2057 is divisible by 11. Thus 11 is a term of this sequence. MAPLE select(n -> 9 + 2 &^ n mod n = 0, [\$1..10^6]); # Robert Israel, Aug 04 2014 PROG (PARI) for(n=1, 10^9, if(Mod(2, n)^n==-9, print1(n, ", "); ); ); CROSSREFS Cf. A051447, A188165, A245594, A245319, A245318, A244673. Sequence in context: A015958 A014951 A223223 * A216131 A338784 A223392 Adjacent sequences: A240939 A240940 A240941 * A240943 A240944 A240945 KEYWORD nonn,more,hard AUTHOR Derek Orr, Aug 04 2014 EXTENSIONS a(7)-a(10) from Lars Blomberg, Nov 05 2014 a(11)-a(15) from Max Alekseyev, Sep 29 2016 STATUS approved

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Last modified November 26 14:22 EST 2022. Contains 358362 sequences. (Running on oeis4.)