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 A185073 #19 Aug 20 2021 10:03:52 %S A185073 13,1493,5851,6379,125101 %N A185073 Numbers n such that (34^n - 1)/33 is prime. %H A185073 H. Dubner, <a href="http://dx.doi.org/10.1090/S0025-5718-1993-1185243-9">Generalized repunit primes</a>, Math. Comp., 61 (1993), 927-930. %H A185073 H. Lifchitz, <a href="http://www.primenumbers.net/Henri/us/MersFermus.htm">Mersenne and Fermat primes field</a> %H A185073 P. Bourdelais, <a href="https://listserv.nodak.edu/cgi-bin/wa.exe?A2=NMBRTHRY;417ab0d6.0906">A Generalized Repunit Conjecture</a> %t A185073 Select[Prime[Range[100]], PrimeQ[(34^#-1)/33]&] %o A185073 (PARI) isok(n) = isprime((34^n-1)/33); \\ _Michel Marcus_, Mar 13 2016 %o A185073 (PARI) lista(nn) = for(n=1, nn, if(ispseudoprime((34^n - 1)/33), print1(n, ", "))); \\ _Altug Alkan_, Mar 13 2016 %Y A185073 Cf. A028491, A004061, A004062, A004063, A004064, A004023, A005808, A016054, A006032, A006033, A006034, A006035, A098438, A127995-A128005. %K A185073 hard,more,nonn %O A185073 1,1 %A A185073 _Robert Price_, Mar 10 2012 %E A185073 a(5)=125101 corresponds to a probable prime discovered by _Paul Bourdelais_, Nov 20 2017