Some say that numbers aren't as important as actual functions, but we say they are! :-) For anyone who has wondered why 13 is unlucky, why you can't eat pi, or why 1 is the multiplicative identity, this is the category you've been searching for since grade school. Whatever intellectual curiosity has been nagging at you since you first wrote the number 5, you will be likely to find an answer to your question here. And if not, submit your own!
Also:
Definitions of important constants, formulas to compute them and formulas that use them.

### Subcategories 10

### Related categories 3

### Sites 17

37 Heaven

Collects information around the number thirty-seven.

Absolutely Abnormal Numbers

Published as math.NT/0006089, this note investigates numbers that are normal to no base whatsoever, and writes down explicitly such a number.

Arabic numerals

Describes the history of the Arabic numeral system that is in use nearly all over the world today.

Ask Dr. Math: History of the Terms Google and Googleplex

Explains how these very large numbers (1 followed by a hundred zeroes, and 1 followed by a google of zeroes, respectively) were named. With links to references. From Swarthmore's Dr. Math.

Catalan Number -- MathWorld

Illustration of the Catalan numbers related to Euler's polygon division problem.

FAQ on Special Numbers

Answers to Frequently asked questions about special numbers.

Fibonacci Numbers and the Golden section in Nature

Puzzles and things to do, for schools, teachers, colleges up to university level students, or just for recreation.

Indian numerals

Describes the history of the Indian numeral system.

Jewish Encyclopedia: Numbers and Numerals

Discusses the uses and symbolism of various numbers in Hebrew literature.

Mathematical Constants and Computation

Essays, references, links, software.

RJN's More Digits of Irrational Numbers

Several million digits of e, and the square roots of 2, 3, 5, 6, 7, 8, and 10.

Stewy's Site

The infinitesimal is the opposite of infinity, and mathematicians still argue over its existence. This page probes into one of the weirdest numbers in mathematics.

Sum Beastliness

Some simple mathematics associated with 666, the Number of the Beast.

Timothy J. Warnock: Blog

Dedicated to the natural order of the universe and to the irrational and logical chaos it presents.

Triangular Numbers

Properties of triangular numbers including reversible, happy, harshad, highly composite, deficient, abundant ones.

Wikipedia - Mathematical constant

A list of constants with links to more detailed information.

World of Numbers

Includes a collection of randomly gathered numbers, curios, puzzles, palindromes and primes.

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October 5, 2016 at 6:45:10 UTC
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