forgot title need help please. I read this book in the 80's

[anniemull]

Can't remember title old book. The way the chapters numbered was unique they counted backward. The end of the book was a timer that ran down to 0000. The main character traveled to a space colony to stop the computer from destruction. If anyone can help me with the title I read this book in the 80's it was published before that

 

[Browny]

I doubt this is it, but the novel of The Running Man had similar numbering, counting down.

I'd post a link, but I'm too much a noob here. Google/Wiki for details.