# how to represent Sum in latex [duplicate]

I want to represent the following sum in LaTeX.

I have tried it in the following way:

$$\sum_{{1 \le k \le n}_{ k odd}} k^2$$


You need to load the amsmath package and employ its \substack directive.

\documentclass{article}
\usepackage{amsmath}
\usepackage{newpxtext}             % Palatino text font
\usepackage[euler-digits]{eulervm} % Euler math font

\begin{document}
$\sum_{\substack{1 \le k < 100 \\ \textup{k odd}}} k^2$
\end{document}

• @barbarabeeton - Thanks for this. I changed \text to \textup. (We don't know if the default text font is sans-serif -- in which case "odd" would look, well, odd, if it were typed in the roman font face...)
– Mico
Apr 4 '18 at 15:28
• What is \usepackage[euler-digits]? Apr 4 '18 at 21:23
• @Sebastiano - euler-digits is an option passed to the package eulervm. I included the font-related directives in order to replicate the "look" of the OP's screenshot.
– Mico
Apr 4 '18 at 21:43