This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A033982 #23 Oct 08 2018 18:13:56 %S A033982 1,3,262279,143823239,382114303,1223853491,381541784791,556985326431, %T A033982 6236258437049,98828020264153 %N A033982 Integers n such that 2^n == 11 (mod n). %C A033982 894157816841269897394424491194255510200782699 belongs to this sequence. [From Max Alekseyev] %H A033982 Joe K. Crump, <a href="http://web.archive.org/web/20070614175509/http://www.immortaltheory.com/NumberTheory/2nmodn.htm">2^n mod n</a> %t A033982 m = 11; Join[Select[Range[m], Divisible[2^# - m, #] &], %t A033982 Select[Range[m + 1, 10^3], PowerMod[2, #, #] == m &]] (* _Robert Price_, Oct 08 2018 *) %Y A033982 Cf. A125000, A124974, A033983, A033981, A050259, A124977, A124965, A015911, A015910. %Y A033982 Cf. A015910, A015911, A033981, A050259, A124965, A124974, A124977, A015910, A015911, A033983, A125000. %K A033982 nonn,more %O A033982 1,2 %A A033982 Joe K. Crump (joecr(AT)carolina.rr.com) %E A033982 Edited by _N. J. A. Sloane_, Jul 03 2008 at the suggestion of _R. J. Mathar_ %E A033982 Terms 1, 3 prepended by _Max Alekseyev_, May 18 2011 %E A033982 a(9), a(10) from _Max Alekseyev_, Jul 30 2011