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 A049984 #23 Feb 18 2025 10:46:20
%S A049984 2,5,19,97,601,35281,5748019201,2311256907767808001,
%T A049984 594596384994354462720001,
%U A049984 5382999938946608755288342267304597177897268019200000000001,136332557214406957166109544809874331662074014454506289616400595025920000000000001
%N A049984 Primes of the form n! - (n-1)! + 1.
%C A049984 Primes in A188914.
%F A049984 a(n) = A188914(A049432(n)). - _Elmo R. Oliveira_, Feb 18 2025
%t A049984 f[n_]:=n!+n; lst={};Do[If[PrimeQ[f[n+1]-f[n]],AppendTo[lst,f[n+1]-f[n]]],{n,0,5!}];lst (* _Vladimir Joseph Stephan Orlovsky_, Jun 27 2009 *)
%Y A049984 Cf. A188914. For more terms, see A049432.
%K A049984 nonn
%O A049984 1,1
%A A049984 _N. J. A. Sloane_