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 A332506 #4 Jun 12 2020 00:08:08
%S A332506 5,5,4,4,1,0,0,1,7,3,9,6,4,4,2,5,8,3,5,2,6,9,9,7,4,6,7,8,8,8,5,1,3,2,
%T A332506 3,6,4,3,8,0,9,2,7,0,3,9,8,4,9,4,5,4,1,7,6,9,8,4,2,0,8,5,4,8,8,4,2,3,
%U A332506 4,8,1,5,7,6,8,8,8,7,0,4,0,2,6,5,6,6
%N A332506 Decimal expansion of the number snc(2 Pi), where snc is the sine-normal-to-cosine function; see A332500.
%F A332506 snc(2 Pi) = 2 Pi + snc(0), where snc(0) = Dottie number (A003957).
%e A332506 snc(2 Pi) = 5.544100173964425835269974678885...
%t A332506 u = u /. FindRoot[ u + Cos[u] == 2 Pi, {u, 0}, WorkingPrecision -> 150]
%t A332506 RealDigits[u][[1]]
%Y A332506 Cf. A332500, A003957, A332523 (numerators of convergents), A332524 (denominators of convergents).
%K A332506 nonn,cons
%O A332506 1,1
%A A332506 _Clark Kimberling_, May 05 2020