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 A103891 #21 Apr 17 2020 07:19:27 %S A103891 2,2,5,5,11,7,19,31,27893,223,554797,10333,29,61,28652131,293049347, %T A103891 7731517,1483,73,337809273983,67,440939,1321,94099,89,107,281, %U A103891 1908113757161297657,479,61,167,3121,177907,5039,11519,281,612153149,587,2753,21491,2897,97,307 %N A103891 Smallest prime factor of prime(n)! / prime(n)# + 1. %H A103891 Reinhard Zumkeller, <a href="/A103890/a103890.txt">prime(n)!/prime(n)#+1</a> %F A103891 a(n) = A020639(A103890(n)). %Y A103891 Cf. A020639, A103856, A103890, A103892. %K A103891 nonn %O A103891 1,1 %A A103891 _Reinhard Zumkeller_, Feb 20 2005 %E A103891 a(28)-a(30) from _Amiram Eldar_, Feb 13 2020 %E A103891 More terms from _Jinyuan Wang_, Apr 16 2020