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 A082879 #16 Jun 06 2024 03:49:42
%S A082879 1,3,30,675,2428956,289620751,10953617995740,3175094503778521,
%T A082879 511050155316058710033
%N A082879 Number of primes not exceeding the factorial of the n-th prime.
%H A082879 Tomás Oliveira e Silva, <a href="http://sweet.ua.pt/tos/primes.html">Tables of values of pi(x) and of pi2(x)</a>. [From _Donovan Johnson_, Feb 18 2010]
%F A082879 a(n) = A000720(A000142(A000040(n))).
%F A082879 a(n) = A003604(prime(n)). - _Amiram Eldar_, Jun 06 2024
%t A082879 Table[PrimePi[Prime[j]! ], {j, 1, 6}]
%Y A082879 Cf. A000040, A000142, A000720, A003604.
%K A082879 nonn,more
%O A082879 1,2
%A A082879 _Labos Elemer_, Apr 16 2003
%E A082879 a(7) from _Donovan Johnson_, Dec 15 2009
%E A082879 a(8) from _Donovan Johnson_, Feb 18 2010
%E A082879 a(9) from the data at A003604 added by _Amiram Eldar_, Jun 06 2024