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 A057189 #12 Oct 30 2017 04:31:55 %S A057189 11,13,67,109,331,587,24071,29881,44053 %N A057189 Numbers n such that (23^n+1)/24 is a prime. %C A057189 Some of the larger terms may only correspond to probable primes. %C A057189 a(10) > 10^5. - _Robert Price_, Jun 04 2013 %H A057189 H. Dubner and T. Granlund, <a href="https://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. %o A057189 (PARI) isok(n) = (denominator(p=(23^n+1)/24)==1) && isprime(p); \\ _Michel Marcus_, Oct 30 2017 %K A057189 nonn,more %O A057189 1,1 %A A057189 _N. J. A. Sloane_, Sep 15 2000 %E A057189 a(7)-a(9) from _Robert Price_, Jun 04 2013