C

n=sqrt(1+2.578/(1-pow(0.1387/x,2))+3.935/(1-pow(22.936/x,2)))

Python

n=(1+2.578/(1-(0.1387/x)**2)+3.935/(1-(22.936/x)**2))**.5

Fortran

n=SQRT(1+2.578/(1-(0.1387/x)**2)+3.935/(1-(22.936/x)**2))

MATLAB

n=sqrt(1+2.578./(1-(0.1387./x).^2)+3.935./(1-(22.936./x).^2))

LaTeX

n^2-1=\frac{2.578λ^2}{λ^2-0.1387^2}+\frac{3.935λ^2}{λ^2-22.936^2}