C

n=sqrt(1+1.0057/(1-0.013217/pow(x,2)))

Python

n=(1+1.0057/(1-0.013217/x**2))**.5

Fortran

n=SQRT(1+1.0057/(1-0.013217/x**2))

MATLAB

n=sqrt(1+1.0057./(1-0.013217./x.^2))

LaTeX

n^2-1=\frac{1.0057λ^2}{λ^2-0.013217}