I want to use \usepackage[sfdefault]{merriweather}, but without the oldstyle numbers. So, I wanted to change the font for numbers on the sections and chapters or use a similar font (Helvetica, maybe?).
I think that the sectsty package has a solution: \partnumberfont and \chapternumberfont.
Unfortunately, I can not use this package. Also, I cannot use XeTeX or LuaTeX.
Update.: @runartrollet give the solution:
\usefont{T1}{phv}{m}{n}\selectfont
\renewcommand{\thechapter}{\usefont{T1}{phv}{m}{n}\selectfont\arabic{chapter}}
\renewcommand{\thesection}{\thechapter.\arabic{section}}
\renewcommand{\thesubsection}{\thesection.\arabic{subsection}}
\renewcommand{\thesubsubsection}{\thesubsection.\arabic{subsubsection}}
Now I have a correlated question, I don't know if I need to create another topic: There is some way to change all "merriweather" numbers to helvetica numbers?
\documentclass{...}and ending with\end{document}. – samcarter_is_at_topanswers.xyz May 30 '16 at 21:37