cp's OEIS Frontend

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.

A197013 Decimal expansion of the shortest distance from x axis through (1,4) to y axis.

Original entry on oeis.org

6, 6, 0, 3, 6, 6, 1, 0, 2, 4, 2, 3, 4, 0, 2, 9, 5, 8, 5, 8, 8, 6, 9, 4, 5, 2, 3, 7, 2, 9, 2, 8, 6, 5, 4, 8, 4, 8, 1, 7, 6, 2, 3, 2, 7, 9, 8, 7, 9, 1, 0, 6, 8, 1, 2, 6, 8, 1, 1, 8, 6, 7, 3, 9, 8, 5, 2, 0, 9, 7, 6, 3, 9, 1, 0, 5, 6, 7, 4, 1, 1, 1, 6, 6, 7, 8, 7, 8, 2, 1, 3, 3, 0, 7, 3, 1, 5, 8, 0, 2
Offset: 1

Views

Author

Clark Kimberling, Oct 10 2011

Keywords

Comments

See A197008 for a discussion and guide to related sequences.

Examples

			d=6.60366102423402958588694523729286548481762327...
x-intercept=(3.5198...,0)
y-intercept=(0,5.5874...)
		

Crossrefs

Cf. A197008.

Programs

  • Mathematica
    f[x_] := x^2 + (k*x/(x - h))^2; t = h + (h*k^2)^(1/3);
    h = 1; k = 4; d = N[f[t]^(1/2), 100]
    RealDigits[d] (* A197013 *)
    x = N[t] (* x-intercept *)
    y = N[k*t/(t - h)] (* y-intercept *)
    Show[Plot[k + k (x - h)/(h - t), {x, 0, t}],
     ContourPlot[(x - h)^2 + (y - k)^2 == .003, {x, 0, 4}, {y, 0, 5}], PlotRange -> All, AspectRatio -> Automatic]