Encyclopedia of integers

Question

Many years ago I read something that mentioned a book I would like to find. Apparently this book is sort of an encyclopedia for integers; each entry lists interesting mathematical facts about that integer. A bit like the The On-Line Encyclopedia of Integer Sequences, but for individual integers.

Unfortunately, my web-searching-fu has failed me. Does this book ring a bell to anyone?

Answer 1

There is also "The Penguin Dictionary of Curious and Interesting Numbers" by David Weils but this does extend beyond integers.

Answer 2

Perhaps you are thinking of The Book of Numbers?