# Book:David Wells/Curious and Interesting Numbers

## David Wells: The Penguin Dictionary of Curious and Interesting Numbers

Published $\text {1986}$

## Contents

Introduction
A List of Mathematicians in Chronological Sequence
Glossary
Bibliography
The Dictionary
Tables
The First $100$ Triangular Numbers, Squares and Cubes
The First $20$ Pentagonal, Hexagonal, Heptagonal and Octagonal Numbers
The First $40$ Fibonacci Numbers
The Prime Numbers less than $1000$
The Factorials of the Numbers $1$ to $20$
The Decimal Reciprocals of the Primes from $7$ to $97$
The Factors of the Repunits from $11$ to $R_{40}$
The Factors, where Composite, and the Values of the Functions $\map \phi n$, $\map d n$ and $\map \sigma n$
Index

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