Sum Beastliness
- Some simple mathematics associated with 666, the Number of the Beast.
- http://web.onetel.com/~amygdala/articles/scimaths/666.html

Inverse Symbolic Calculator
- A set of programs and specialized tables of mathematical constants dedicated to the identification of real numbers.
- http://oldweb.cecm.sfu.ca/projects/ISC/ISCmain.html

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.
- http://www.eingedi.org/666-2.html

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.
- http://www.empirenet.com/~dljones/

Feigenbaum Constants
- Describes the constants and their mathematical basis.
- http://www.mathcad.com/library/constants/fgnbaum.htm

Euler-Mascheroni Constant - g
- Describes the mathematics behind this constant.
- http://www.mathcad.com/library/constants/euler.htm

Catalan's Constant - G
- Describes the mathematics behind the constant.
- http://www.mathcad.com/library/constants/catalan.htm

37 Heaven
- Collects information around the number thirty-seven.
- http://magliery.com/37/

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.
- http://www.meden.demon.co.uk/Mathematics/S-Numbers/S-Numbers.html

Wikipedia - Mathematical constant
- A list of constants with links to more detailed information.
- http://en.wikipedia.org/wiki/Mathematical_constant

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.
- http://www.ee.surrey.ac.uk/Personal/R.Knott/Fibonacci/fibnat.html

World of Numbers
- Contains a collection of randomly gathered numbers, curios, puzzles, palindromes and primes.
- http://www.worldofnumbers.com/

Vampire Numbers
- Numbers with a factorization containing the same digits, e.g. 1530 = 30*51.
- http://hjem.get2net.dk/jka/math/vampires

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.
- http://mathforum.org/library/drmath/view/57575.html

Jewish Encyclopedia: Numbers and Numerals
- Discusses the uses and symbolism of various numbers in Hebrew literature.
- http://www.jewishencyclopedia.com/view.jsp?artid=366&letter=N

Notable Properties of Specific Numbers
- A list of numbers with interesting properties.
- http://home.earthlink.net/~mrob/pub/math/numbers.html

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 G
- http://mathpages.com/home/kmath153.htm

Triangular Numbers
- Properties of triangular numbers including reversible, happy, harshad, highly composite, deficient, abundant ones.
- http://www.shyamsundergupta.com/triangle.htm

Fun With Numbers
- Includes some lists of numerals, relating to basic operations performed on certain constants. Not updated since 1995.
- http://www.newdream.net/~sage/old/numbers/

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.
- http://arxiv.org/abs/math.NT/0006089/

Catalan Number -- MathWorld
- Illustration of the Catalan numbers related to Euler's polygon division problem.
- http://mathworld.wolfram.com/CatalanNumber.html

FAQ on Special Numbers
- Answers to Frequently asked questions about special numbers.
- http://www.faqs.org/faqs/sci-math-faq/specialnumbers/

Heilbronn Triangle Constants
- Heilbronn Triangle Constants
- http://pauillac.inria.fr/algo/bsolve/constant/hlb/hlb.html

Brun's Constant
- Description of the constant, some related work and links to some further reading.
- http://pauillac.inria.fr/algo/bsolve/constant/brun/brun.html

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.
- http://pauillac.inria.fr/algo/bsolve/constant/apery/apery.html

Favorite Mathematical Constants
- An in-depth explanation of the most important math constants.
- http://pauillac.inria.fr/algo/bsolve/constant/constant.html

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.
- http://www.rossi.com/sqr2.htm

Indian numerals
- Describes the history of the indian numeral system.
- http://www-history.mcs.st-andrews.ac.uk/history/HistTopics/Indian_numerals.html

Arabic numerals
- Describes the history of the arabic numeral system that is in use nearly all over the world today.
- http://www-history.mcs.st-andrews.ac.uk/history/HistTopics/Arabic_numerals.html

Number Gossip
- Numerous special categories of numbers, searchable.
- http://www.tanyakhovanova.com/Numbers/

Pi Squared over Six
- Dedicated to the transcendental number pi squared over six.
- http://www.pisquaredoversix.force9.co.uk/

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.
- http://antwrp.gsfc.nasa.gov/htmltest/rjn_dig.html

Verbose.net
- Dedicated to the natural order of the universe and to the irrational and logical chaos it presents.
- http://www.verbose.net/