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 A108512 #10 Aug 09 2021 08:42:36
%S A108512 0,3,2,0,2,1,1,1,0,3,0,2,0,2,3,1,1,8,2,9,2,1,0,5,3,1,0,0,1,0,0,3,1,0,
%T A108512 0,6,3,0,5,2
%N A108512 a(n) is number of solutions of equation prime(x) = n*x - 1.
%e A108512 a(4) = 0 because the equation prime(x) = 4*x - 1 has no solution.
%e A108512 a(20) = 9 because the length of set of the solutions of equation prime(x) = 20*x - 1 namely length of {69709705, 69709719, 69709734, 69709873, 69709878, 69709932, 69709935, 69709944, 69709965} equals 9.
%Y A108512 Cf. A108511, A108514.
%K A108512 nonn,more
%O A108512 1,2
%A A108512 _Farideh Firoozbakht_, Jun 13 2005
%E A108512 a(29)-a(33) from _Donovan Johnson_, Nov 15 2009
%E A108512 a(34)-a(40) from _Jinyuan Wang_, Aug 09 2021