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 A133834 #6 Apr 13 2025 07:55:48 %S A133834 0,1,2,4,23,76,339,1282 %N A133834 Numbers k such that primorial(k)^4 + 1 is prime. %C A133834 Seven terms found and primes proved by PrimeForm ([N-1, Brillhart-Lehmer-Selfridge]). p(1282)#^4 + 1 has 18042 decimal digits. There are no more terms <= 2810. %C A133834 a(9) > 5000. - _Michael S. Branicky_, Apr 13 2025 %e A133834 As primorial(2)^4 + 1 = (3*2)^4 + 1 = 1297 is prime, 2 is a term. %Y A133834 Cf. A002110, A092061. %K A133834 nonn,hard,more %O A133834 1,3 %A A133834 _Rick L. Shepherd_, Sep 26 2007 %E A133834 a(1) = 0 inserted by _Michael S. Branicky_, Apr 13 2025