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 A222255 #8 Mar 28 2013 04:33:11 %S A222255 2,2,2,2,5,5,193,2903041,250822656001,1807729046323200001, %T A222255 1472038679443987759104000001, %U A222255 21817028147643299474152432146548259236610048000000000001 %N A222255 Primes of the form n!/n# + 1, where n#=A034386(n) (primorial), listed with repetition. %C A222255 For each n >= 0, if n!/n#+1 is prime, then this prime is listed here: This explains the repetitions. %C A222255 The next term is already 126 digits long. %F A222255 a(n) = A049614(A140294(n))+1, where A049614 = A000142/A034386. %o A222255 (PARI) for(n=0,99,ispseudoprime(a=n!/prod(k=1,primepi(n),prime(k))+1)&print1(a",")) %K A222255 nonn %O A222255 1,1 %A A222255 _M. F. Hasler_, Mar 27 2013