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 A327943 #31 Nov 10 2022 21:21:52
%S A327943 1,11,341,186787,8607491,9791567,11703131,14320387,50168819,952168003,
%T A327943 71654478989,1328490399527
%N A327943 Numbers m that divide 6^m + 5.
%C A327943 Conjecture: For k > 1, k^m == 1 - k (mod m) has infinitely many positive solutions.
%C A327943 Also includes 11834972807906571233 = 31*381773316384082943. - _Robert Israel_, Oct 03 2019
%C A327943 a(13) > 10^15. - _Max Alekseyev_, Nov 10 2022
%t A327943 Join[{1},Select[Range[98*10^5],PowerMod[6,#,#]==#-5&]] (* The program generates the first six terms of the sequence. To generate more, increase the Range constant but the program may take a long time to run. *) (* _Harvey P. Dale_, Feb 05 2022 *)
%o A327943 (Magma) [1] cat [n: n in [1..10^8] | Modexp(6, n, n) + 5 eq n];
%Y A327943 Solutions to k^m == 1-k (mod m): A006521 (k = 2), A015973 (k = 3), A327840 (k = 4), A123047 (k = 5), this sequence (k = 6).
%Y A327943 Cf. A245318, A277288, A015891, A253209.
%K A327943 nonn,more
%O A327943 1,2
%A A327943 _Juri-Stepan Gerasimov_, Sep 30 2019
%E A327943 a(11) from _Giovanni Resta_, Oct 02 2019
%E A327943 a(12) from _Max Alekseyev_, Nov 10 2022