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

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

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

Mathemagic  
   In praise of the beauty of the numbers pi, e and phi.
   http://members.aol.com/loosetooth/math.html

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

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

Mathematical Constants and Computation  
   Essays, references, links, software.
   http://numbers.computation.free.fr/Constants/constants.html

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.
   http://pw1.netcom.com/~merrills/fibphi.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

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

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.
   http://www.netcom.com/~hjsmith/

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

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

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

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

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

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

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/

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/

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.
   http://stewy6.tripod.com/infinitesimal.htm

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

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

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

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

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

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

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

Sum Beastliness  
   Some simple mathematics associated with 666, the Number of the Beast.
   http://www.geocities.com/aladgyma/articles/scimaths/666.htm

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

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

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

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

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

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