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 A278976 #12 Dec 06 2016 22:36:49
%S A278976 1,216,334,349,351,426,434,576,591,632,636,638,649,656,660,665,764,
%T A278976 771,936,939,953,1125,1127,1165,1168,1198,190780,190793,190797,190870,
%U A278976 190880,191094
%N A278976 In the ternary Pi race between digits one and two, where the race leader changes.
%H A278976 Hans Havermann, <a href="/A278976/b278976.txt">Table of n, a(n) for n = 1..10000</a>
%e A278976 Ternary Pi is 10.01021101222201021100211...
%e A278976 With no digits of ternary Pi, there are an equal number of ones and twos. 1 is in the sequence because with the initial digit of ternary Pi, 1 has now taken the count lead over 2 (1-0). 216 is the next term because with 216 initial digits of ternary Pi, 2 has now taken the count lead over 1 (75-74). 334 is the next term because with 334 initial digits, 1 regains the count lead over 2 (119-118).
%t A278976 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[(o > t && flag != 1) || (o < t && flag != -1), AppendTo[lst, k]; flag = -flag]; k++]; lst
%Y A278976 Cf. A004602, A278920, A278974, A278975, A278979.
%K A278976 nonn,base
%O A278976 1,2
%A A278976 _Hans Havermann_ and _Robert G. Wilson v_, Dec 03 2016