Rightmost points of the Mandelbrot Set

Using Euler Math Toolbox with the plotting function given at the end of this article, I did a search for the rightmost points of the Mandelbrot sets.  My candidate for the rightmost points are in the neighborhood of 0.4708247 + i*0.3478550 (and its conjugate).  Not sure what the significance of those values is.

right-most points of mandelbrot set zoomed in

function Mandelbrot(a,b,c,d,n=500,m=100)
z=linspace(a,b,n)+1i*linspace(c,d,n)’;
h=zeros(size(z));
loop 1 to m
h = z + (h)^2;
h=(abs(h)>10)*10+(abs(h)<=10)*h;
end
density(log(max(abs(h),1))>0.001);
setplot(a,b,c,d);
xplot();
return h;
endfunction