Removing chapter titles but not the chapter number

Question

Using \chapter{Title of Chapter X} I get the chapter number and then under it the tile at the beginning of every chapter:

Chapter 1
Title of Chapter 1
Chapter 2
Title of Chapter 2
Chapter 3
Title of Chapter 3

I want to have the chapters given just by number, with the space where the title would go also deleted:

Chapter 1
Chapter 2
Chapter 3

(And then in the contents page, it should have the chapters listed just by number too.)

Does anyone know how I can achieve this?

Answer 1

The gap can be adjusted by \vspace:

\documentclass[11pt,openany]{book}
\usepackage{lipsum}
\begin{document}
\chapter{title of Chapter 1}
\lipsum[1]
\chapter{}
\lipsum[2]
\chapter{}
\vspace{-24pt}
\lipsum[3]
\end{document}

See Space before chapters and contents for more possible solutions.