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 A214925 #24 Sep 02 2025 22:52:51 %S A214925 5,5,5,10,25,31,104,159,190,219,1186,1832,2227,3388,14358,30804,31547, %T A214925 40935,103522,104072,149690,325853,1094426,1319950,2850175,6957880, %U A214925 10539433,10655464 %N A214925 Number of primes <= A214757(n). %F A214925 a(n) = pi(A214757(n)) = A000217(A214757(n)). %e A214925 A214757(4) = 29, so a(4) = primepi(A214757(4)) = primepi(29) = 10. %Y A214925 Cf. A000101, A104272, A214756, A001223. %Y A214925 Cf. A002386, A214924, A214926, A214757. %K A214925 nonn,more,changed %O A214925 1,1 %A A214925 _John W. Nicholson_, Aug 06 2012 %E A214925 Extension to a(28) added by _John W. Nicholson_, Nov 11 2013