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 A278978 #10 Dec 13 2017 04:19:33 %S A278978 0,1,13,15,16,18,19,20,31,32,127,146,147,151,152,154,155,183,184,188, %T A278978 4852,4854,4855,5375,5490,5493,5539,5540,5542,5547,5624,5625,5628, %U A278978 5629,5649,5652,5657,5659,5661,5662,5664,5667,5669,5670,5671,5672,5674,5681,5685,5687,5688,5696,5701,5703,5718,5731,5733,5735,5738,5827,5829,5830 %N A278978 Number of initial digits of ternary Pi wherein the digit counts of zeros and twos are exactly equal. %H A278978 Hans Havermann, <a href="/A278978/b278978.txt">Table of n, a(n) for n = 1..7441</a> %e A278978 Ternary Pi is 10.01021101222201021100211... %e A278978 0 is in the sequence because the first 0 digits contain 0 zeros and 0 twos. %e A278978 15 is in the sequence because the first 15 digits contain 5 zeros and 5 twos. %e A278978 16 is in the sequence because the first 16 digits contain 5 zeros and 5 twos. %Y A278978 Cf. A004602, A039624, A278975, A278977, A278979. %K A278978 nonn,base %O A278978 1,3 %A A278978 _Hans Havermann_, Dec 03 2016