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 A214924 #19 Nov 13 2013 17:10:48 %S A214924 1,1,1,7,20,28,96,152,185,212,1179,1829,2217,3382,14350,30780,31528, %T A214924 40929,103498,104047,149674,325845,1094396,1319933,2850163,6957867, %U A214924 10539421,10655453 %N A214924 Number of primes <= A214756(n). %C A214924 a(n) = pi(A214756(n)). %F A214924 a(n) = A000217(A214756(n)) %e A214924 A214756(5) = 71, so a(5) = primepi(A214756(5)) = primepi(71) = 20. %Y A214924 Cf. A000101, A104272, A214756, A001223. %Y A214924 Cf. A002386, A214925, A214926, A214757. %K A214924 nonn %O A214924 1,4 %A A214924 _John W. Nicholson_, Jul 29 2012 %E A214924 Extension to a(28) added by _John W. Nicholson_, Nov 11 2013