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 A132635 #12 Apr 06 2020 00:20:19
%S A132635 0,1,4,6,8,11,13,17,20,24,27,32,36,41,46,50,56,63,68,74,80,87,94,101,
%T A132635 107,116,124,131,139,148,156,164,174,183,193,202,212,221,230,242,253,
%U A132635 265,276,285,297,308,321,331,344,359,369,380,395,411,423,436,447,459,476
%N A132635 Number of primes, 0's, and 1's in [0, n^2).
%C A132635 Number of p-adic cyclotomic type levels in A_n-1 or SU(n).
%F A132635 a(n) = pi(n^2) + 2 = A038107(n) + 2, n > 1. [_Charles R Greathouse IV_, Nov 07 2011]
%e A132635 SU(5) at n^2-1=24 is exactly inside SU(9) at n^2-1=80.
%t A132635 Table[Sum[If[m == 0 || m == 1, 1, If[PrimeQ[m], 1, 0]], {m, 0,n^2 - 1}], {n, 0, 30}]
%o A132635 (PARI) a(n)=if(n<2,n,primepi(n^2)+2) \\ _Charles R Greathouse IV_, Nov 07 2011
%K A132635 nonn,easy
%O A132635 0,3
%A A132635 _Roger L. Bagula_ and _Gary W. Adamson_, Aug 26 2008