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 A191835 #14 Aug 11 2015 00:00:54 %S A191835 2,3,205,301,455,1015,1085,2485,4823,5467,16891,47905 %N A191835 Primitive n such that k^k == k+1 (mod n) has no nonzero solutions. %C A191835 After the initial 2, 3, primitive elements of A191834. %K A191835 nonn,more %O A191835 1,1 %A A191835 _Franklin T. Adams-Watters_, Jun 17 2011 %E A191835 a(11)-a(12) from _Max Alekseyev_, Sep 10 2013