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 A173767 #19 Aug 27 2023 01:43:41 %S A173767 11,31,41,1571,25771,181981 %N A173767 Primes p such that (53^p - 1)/52 is also prime. %H A173767 R. Fischer, <a href="http://www.fermatquotient.com/PrimSerien/GenRepu.txt">Generalized repunit primes of the form (B^N-1)/(B-1)</a> %K A173767 nonn,more %O A173767 1,1 %A A173767 _Vincenzo Librandi_, Mar 05 2010 %E A173767 Partially checked by _Michael B. Porter_, Jun 16 2010 %E A173767 a(5)-a(6) from R. Fischer's webpage added by _Max Alekseyev_, Aug 26 2023