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 A103859 #13 Jun 19 2025 23:51:06 %S A103859 1,1,4,2,4,4,4,4,16,4,8,16,16,32,32,8,32,8,16,64,32,16,32,64,512,2,16 %N A103859 Number of divisors of prime(n)! - prime(n)# + 1. %H A103859 Reinhard Zumkeller, <a href="/A103855/a103855.txt">p(n)! - p(n)# + 1</a>. %F A103859 a(n) = A000005(A103855(n)). %o A103859 (PARI) a(n) = numdiv(prime(n)! - prod(k=1, n, prime(k)) + 1); \\ _Michel Marcus_, Nov 06 2022 %Y A103859 Cf. A000005, A103855, A103858, A103860, A103894. %K A103859 nonn,more %O A103859 1,3 %A A103859 _Reinhard Zumkeller_, Feb 20 2005 %E A103859 a(27) from _Jinyuan Wang_, Jun 19 2025