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 A088731 #6 Jun 09 2019 15:34:13
%S A088731 1,24,3122,823540,285311670608,302875106592250,827240261886336764174,
%T A088731 1978419655660313589123976,20880467999847912034355032910564,
%U A088731 2567686153161211134561828214731016126483466
%N A088731 Numbers of the form p^p - 3 where p is prime.
%C A088731 Sum of reciprocals = 1.041988188435472536468359944..
%t A088731 #^#-3&/@Prime[Range[20]] (* _Harvey P. Dale_, Jun 09 2019 *)
%o A088731 (PARI) ptop(n,m) = { sr=0; forprime(x=2,n, y=x^x-m; print1(y","); sr += 1.0/y; ); print(); print(sr) }
%K A088731 nonn
%O A088731 1,2
%A A088731 _Cino Hilliard_, Nov 23 2003