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 A112855 #6 Nov 21 2013 12:48:45 %S A112855 1,2,5,10,24,30,72,340,379,712,1020,1647,3654,7923 %N A112855 Numbers n such that (2*n)!/n!+1 is prime. %C A112855 Next term is > 10000. %t A112855 Select[Range[8000],PrimeQ[(2#)!/#!+1]&] (* _Harvey P. Dale_, Mar 23 2012 *) %Y A112855 Cf. A112856 primes of the form (2*n)!/n!+1, A112853 (2*n)!/n!-1 is prime, A066726 (2*n)!/(n!)^2-1 is prime, A112859 (2*n)!/(n!)^2+1 is prime, A112861 (2*n)!/(2*(n!)^2)-1 is prime, A112863 (2*n)!/(2*(n!)^2)+1 is prime. %K A112855 hard,nonn %O A112855 1,2 %A A112855 _Hugo Pfoertner_, Sep 25 2005