Wells D. The Penguin Dictionary of Curious and Interesting Numbers 1987 torrent

Textbook in PDF format

First published in 1986, this mind-boggling and entertaining dictionary, arranged in order of magnitude, exposes the fascinating facts about certain numbers and number sequences - very large primes, amicable numbers and golden squares to give but a few examples.
A List of Mathematicians in Chronological Sequence
The Dictionary
Tables
The First 100 Triangular Numbers, Squares and Cubes
The First 20 Pentagonal, Hexagonal, Heptagonal and Octagonal Numbers
The First 40 Fibonacci Nurnbers
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 R40
The Factors, where Composite, and the Values of the Functions φ(n), d(n) and σ(n)