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 - 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 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.
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.
Jewish Encyclopedia: Numbers and Numerals: Discusses the uses and symbolism of various numbers in Hebrew literature.
Just Who is Mr. 666?: Uses gematria to calculate the number of the beast, and evaluates what it may mean w/r specific Hebrew words and names in the Bible adding up to 666.
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.