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 A332521 #9 Jun 02 2025 08:14:27
%S A332521 2,4,8,3,8,0,4,0,1,0,2,9,4,7,4,0,9,0,1,4,7,3,2,5,7,3,6,9,1,4,8,6,8,8,
%T A332521 9,9,2,5,1,8,5,8,3,0,5,4,8,9,7,5,2,3,3,2,3,6,6,6,7,5,2,8,0,6,5,4,3,5,
%U A332521 8,0,1,5,0,8,6,6,8,9,4,8,0,9,0,1,7,1
%N A332521 Decimal expansion of the number u such that the line normal to the graph of y = sin x at (u, sin u) passes through (2,0).
%e A332521 u = 2.483804010294740901473257369...
%t A332521 u = u /. FindRoot[0 == - 2 Sec[u] + u Sec[u] + Sin[u], {u, 0}, WorkingPrecision -> 150]
%t A332521 RealDigits[u][[1]]
%Y A332521 Cf. A332500, A332507.
%K A332521 nonn,cons
%O A332521 1,1
%A A332521 _Clark Kimberling_, May 05 2020