I'm using the following setup for the Libertine font:
\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[lining]{libertine}
\usepackage[libertine, cmintegrals]{newtxmath}
\begin{document}
Test: $75 + 250\log_2 n = 75 + \frac{250}{\log_{10} 2} \log_{10} n$
\end{document}
But the spacing for inline math seems to be a little strange:
Compare the spacing of = and the numbers in the denominator to the output with mathpazo or mathdesign/Utopia:
In my opinion the Libertine results look more uneven and poorly spaced. Is this just how the font looks, or is there something I can do to make this look better?
