C

n=sqrt(1+6.055+2.669/(1-167.8/pow(x,2)))

Python

n=(1+6.055+2.669/(1-167.8/x**2))**.5

Fortran

n=SQRT(1+6.055+2.669/(1-167.8/x**2))

MATLAB

n=sqrt(1+6.055+2.669./(1-167.8./x.^2))

LaTeX

n^2-1=6.055+\frac{2.669λ^2}{λ^2-167.8}