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 A177692 #3 Mar 30 2012 18:40:08 %S A177692 0,2,2,4,4,4,4,6,6,6,6,8,8,8,8,10,10,12,12,12,12,14,14,14,14,16,16,16, %T A177692 16,16,16,18,18,18,18,18,18,20,20,22,22,22,22,24,24,24,24,24,24,24,24, %U A177692 26,26,28,28,30,30,30,30,30,30,30,30,30,30,30,30,30,30,32,32,32,32,32 %N A177692 The even values of PrimePi(.), with repetition. %F A177692 Obtained by removing all odd numbers from A000720. Block lengths (frequencies of repetitions) are in A088680. %Y A177692 Cf. A000720, A005843. %K A177692 nonn,easy %O A177692 1,2 %A A177692 _Giovanni Teofilatto_, May 11 2010 %E A177692 Erroneous formula removed by _R. J. Mathar_, May 14 2010