How to write numbers in boldface type using LaTeX Beamer

Question

I want to write a vector $1_n$ in bold face where all its entries are one. I have tried all of the following, but it will not work. I even included userpackage{bm}. But not working. Any help, please?
$bm{1}_n$
$boldsymbol{1}_n$
$mathbf{1}_n$
$textbf{1}_n$

Userabc · Answer

I used package usepackage{amsbsy} and I wrote it as pmb{1}_n. It works fine for me now.

Zarko · Answer

It is unclear, what is your problem. More certain we can be, if you would provide an MWE (Minimal Working Example), a small but complete document. As example of it with your code fragment is:
documentclass{beamer}
usepackage{bm}

begin{document}
begin{frame}[fragile]
frametitle{Comparison of normal and boldface math variables}
verb+bm+:qquad          $1_n, bm{1}_n$
verb+boldsymbol+:qquad  $1_n, boldsymbol{1}_n$
verb+mathbf+:qquad      $1_n, mathbf{1}_n$
%$textbf{1}_n$ this should not be used 
end{frame}
end{document}

which gives expected result:

How to write numbers in boldface type using LaTeX Beamer

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