\documentclass[a5paper]{article}
\usepackage[margin=5mm]{geometry}
\usepackage{xcolor}
\usepackage{randintlist-l3}
\begin{document}
10 numbers, between 1 and 100, without repetition:
\hfill\rdlgenlist[min=1,max=100,nb=10,repeat=false]{\mylist}\textcolor{red}{\mylist}\hfill~
The 5th value is:
\hfill\textcolor{blue}{\rdlgetitem*{\mylist}{5}}\hfill~
10 numbers, between 1 and 100, without multiples of 5:
\hfill\rdlgenlist[min=1,max=100,nb=10,excluded={5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,95,100}]{\mylist}\textcolor{olive}{\mylist}\hfill~
The 9th value is:
\hfill\textcolor{purple}{\rdlgetitem*{\mylist}{9}}\hfill~
\end{document}