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 A057184 #30 Aug 20 2021 10:01:39 %S A057184 3,7,23,73,733,941,1097,1933,4651,481147 %N A057184 Numbers n such that (18^n + 1)/19 is a prime. %H A057184 J. Brillhart et al., <a href="http://dx.doi.org/10.1090/conm/022">Factorizations of b^n +- 1</a>, Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 3rd edition, 2002. %H A057184 H. Dubner and T. Granlund, <a href="http://www.cs.uwaterloo.ca/journals/JIS/VOL3/DUBNER/dubner.html">Primes of the Form (b^n+1)/(b+1)</a>, J. Integer Sequences, 3 (2000), #P00.2.7. %H A057184 H. Lifchitz, <a href="http://www.primenumbers.net/Henri/us/MersFermus.htm">Mersenne and Fermat primes field</a> %H A057184 Paul Bourdelais, <a href="https://listserv.nodak.edu/cgi-bin/wa.exe?A2=NMBRTHRY;417ab0d6.0906">A Generalized Repunit Conjecture</a> %K A057184 nonn %O A057184 1,1 %A A057184 _N. J. A. Sloane_, Sep 15 2000 %E A057184 a(10) = 481147 corresponds to a probable prime, which was found using PFGW v3.3.1. - _Paul Bourdelais_, Jul 27 2011