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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.

[ e ]

Perfect_Numbers@	Prime_Numbers@
Pseudorandom Numbers@	Cryptography
Counting and Numbers	Number Theory
0 - Zero	Fibonacci Numbers
Infinity	Integers
Pi	e
phi

• 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.
• Apéry's Constant Describes the definition of the constant and some interpretations as well as a list of references to further work about the constant.
• 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.
• Brun's Constant Description of the constant, some related work and links to some further reading.
• Catalan Number -- MathWorld Illustration of the Catalan numbers related to Euler's polygon division problem.
• Catalan's Constant - G Describes the mathematics behind the constant.
• Deep Thought A website devoted to tracking the Ultimate Answer provided by the computer Deep Thought.
• Deep Thought - 42 A website devoted to tracking the Ultimate Answer provided by the computer Deep Thought. Lists sightings of the number since early history.
• Euler-Mascheroni Constant - g Describes the mathematics behind this constant.
• FAQ on Special Numbers Answers to Frequently asked questions about special numbers.
• Favorite Mathematical Constants An in-depth explanation of the most important math constants.
• Feigenbaum Constants Describes the constants and their mathematical basis.
• Fibonacci Numbers and The Golden Ratio Link Web Page A long list of links to pages about Fibonacci and his numbers, the golden ratio and applications in art and science.
• 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.
• Friedmann's S-Numbers These are numbers where an expression can be given using the operations of addition and squaring, using the digits of a number in order, which gives the original number. Algorithms, theorems and results.
• Fun With Numbers Includes some lists of numerals, relating to basic operations performed on certain constants. Not updated since 1995.
• Harry J. Smith's Fun With Mathematics Fun math stuff, including computing pi, perfect numbers, Fibonacci numbers, the tesseract, a look into 4-dimensional space.
• Harry J. Smith's Fun With Mathematics Fun math stuff, including computing pi, perfect numbers, Fibonacci numbers, the tesseract, a look into 4-dimensional space.
• Heilbronn Triangle Constants Heilbronn Triangle Constants
• Indian numerals Describes the history of the indian numeral system.
• Inverse Symbolic Calculator A set of programs and specialized tables of mathematical constants dedicated to the identification of real numbers.
• Inverse Symbolic Calculator A set of programs and specialized tables of mathematical constants dedicated to the identification of real numbers.
• Inverse Symbolic Calculator A set of programs and specialized tables of mathematical constants dedicated to the identification of real numbers. One of the main ongoing projects at the Centre for Experimental and Constructive Mathematics (CECM). Introduction, Pi pages, resources, credits, references and bibliography.
• Jewish Encyclopedia: Numbers and Numerals Discusses the uses and symbolism of various numbers in Hebrew literature.
• Mathemagic In praise of the beauty of the numbers pi, e and phi.
• Mathematical Constants and Computation Essays, references, links, software.
• Notable Properties of Specific Numbers A list of numbers with interesting properties.
• Number Gossip Numerous special categories of numbers, searchable.
• Pi Squared over Six Dedicated to the transcendental number pi squared over six.
• 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.
• Square root of 2 Provides information about the square root of 2, lists the first 1000 digits and provides links to pages with up to 5 million digits. Also contains download links for programming libraries for calculating numbers with high precision or many digits.
• 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.
• The Golden Pentagon MathPages depiction of tiling a plane using a progression of equilateral triangles dividing a pentagon. Most interesting is that this pentagon is uniquely and recursively divided by triangles, just as is seen in the more common recursive division of the Golden Rectangle.
• Triangular Numbers Properties of triangular numbers including reversible, happy, harshad, highly composite, deficient, abundant ones.
• Vampire Numbers Numbers with a factorization containing the same digits, e.g. 1530 = 30*51.
• Verbose.net Dedicated to the natural order of the universe and to the irrational and logical chaos it presents.
• Wikipedia - Mathematical constant A list of constants with links to more detailed information.
• World of Numbers Contains a collection of randomly gathered numbers, curios, puzzles, palindromes and primes.

 

 

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