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 A339450 #7 Dec 21 2020 07:41:35 %S A339450 0,4,87640,206648324,206657530,206657532,206657560,206657576 %N A339450 Numbers k such that there are equal numbers of 0's and 1's and equal numbers of 2's and 3's among the first k digits of the quaternary representation of Pi. %C A339450 There are no more terms below 2*10^9. %e A339450 4 is a term because the first four quaternary digits of Pi are 3, 0, 2, 1, one of each digit. %e A339450 87640 is a term because among the first 87640 digits there are 21880 0's, 21880 1's, 21940 2's and 21940 3's. %Y A339450 Cf. A004603, A039624, A339449. %K A339450 nonn,base,more %O A339450 1,2 %A A339450 _Pontus von Brömssen_, Dec 05 2020