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 A133920 #11 Feb 16 2025 08:33:06
%S A133920 2,2,9,9,9,1,0,3,3,0,2,2,8,4,1,0,9,1,4,9,5,8,1,1,0,6,9,1,0,5,0,6,2,5,
%T A133920 4,4,7,2,6,5,6,7,3,2,9,0,3,6,5,8,0,5,6,1,1,2,7,4,9,9,5,5,1,6,1,6,8,6,
%U A133920 9,1,6,3,7,5,0,5,3,5,7,5,9,3,8,7,0,9,1,9,4,9,8,9,6,3,9,6,8,2,6,0,6,9,4,1,2
%N A133920 Decimal expansion of the first real inflection point of the jinc function.
%H A133920 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/JincFunction.html">Jinc Function</a>
%e A133920 2.2999103302284109149...
%t A133920 x0 = x /. FindRoot[3x*BesselJ[0, x] + (x^2 - 6)*BesselJ[1, x] == 0, {x, 2}, WorkingPrecision -> 105]; RealDigits[x0][[1]] (* _Jean-François Alcover_, Oct 26 2012, after _Eric W. Weisstein_ *)
%o A133920 (PARI) solve(x=2,3,3*x*besselj(0,x)+(x^2-6)*besselj(1,x)) \\ _Charles R Greathouse IV_, Feb 19 2014
%K A133920 nonn,cons
%O A133920 1,1
%A A133920 _Eric W. Weisstein_, Sep 28 2007