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 A278975 #12 Dec 06 2016 22:36:37
%S A278975 2,14,17,33,156,189,4853,5494,5541,5548,5663,5665,5668,5673,5686,5689,
%T A278975 5702,5704,5719,5732,5739,5831,5834,5839,5845,5847,5905,5913,5925,
%U A278975 5928,5950,5978,5980,5986,6000
%N A278975 In the ternary Pi race between digits zero and two, where the race leader changes.
%H A278975 Hans Havermann, <a href="/A278975/b278975.txt">Table of n, a(n) for n = 1..2508</a>
%e A278975 Ternary Pi is 10.01021101222201021100211...
%e A278975 With no digits of ternary Pi, there are an equal number of zeros and twos. 2 is in the sequence because with the initial 2 digits of ternary Pi, 0 has now taken the count lead over 2 (1-0). 14 is the next term because with 14 initial digits of ternary Pi, 2 has now taken the count lead over 0 (5-4). 17 is the next term because with 17 initial digits, 0 regains the count lead over 2 (6-5).
%t A278975 pib = RealDigits[Pi, 3, 5000000][[1]]; flag = -1; z = o = t = 0; k = 1; lst = {}; While[k < 5000001, Switch[ pib[[k]], 0, z++, 1, o++, 2, t++]; If[(z > t && flag != 1) || (z < t && flag != -1), AppendTo[lst, k]; flag = -flag]; k++]; lst
%Y A278975 Cf. A004602, A278920, A278974, A278976, A278978.
%K A278975 nonn,base
%O A278975 1,1
%A A278975 _Hans Havermann_ and _Robert G. Wilson v_, Dec 03 2016