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 A099339 #6 Sep 20 2023 05:42:51
%S A099339 1,6,71,646,6287,62545,625489,6251102,62501242,624989166,6250025693,
%T A099339 62499925426
%N A099339 Frequency of the hexadecimal 6 in the first 10^n hexadecimal digits of Pi.
%t A099339 $MaxPrecision = 1100000; ph = Drop[ RealDigits[Pi, 16, 5*10^5] [[1]], 1]; Table[ Count[ Take[ph, 10^n], 6], {n, 5}]
%Y A099339 Cf. A000796, A062964, A099333, A099334, A099335, A099336, A099337, A099338, A099340, A099341, A099342, A099343, A099344, A099345, A099346, A099347, A099348.
%K A099339 base,nonn,more
%O A099339 1,2
%A A099339 _Robert G. Wilson v_, Oct 12 2004