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 A193430 #28 Mar 02 2014 02:55:53 %S A193430 23,6911,5944066965503999 %N A193430 Primes p such that p+1 is in A055462. %C A193430 Prime numbers that are one less than the product of first n superfactorials. %C A193430 The next term, if it exists, has more than 75,000 digits. %C A193430 Subsequence of A238265. %F A193430 a(n) are the prime values of 1! * (1! * 2!) * (1! * 2! * 3!) * (1! * 2! * 3! * ... * n!) - 1 %e A193430 23 is a term because 23 = 1! * (1! * 2!) * (1! * 2! * 3!) - 1. %o A193430 (PARI) t=1;k=1;for(n=2,100,t*=n!;k*=t;if(ispseudoprime(k-1),print1(k-1", "))) \\ _Charles R Greathouse IV_, Jul 28 2011 %Y A193430 Cf. A005462, A000040. %K A193430 nonn,bref,hard %O A193430 1,1 %A A193430 _Kausthub Gudipati_, Jul 28 2011