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Fibonacci Numbers (14) Prime Numbers *(106)
Infinity (5) phi (12)
Pi (50)  

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2001 Game - Attempts to write all integers from 1 to 100 using only the digits 2,0,0,1 and arithmetic operations.
222 Divine - Some interesting facts associated with 111, the second repunit, and its multiples (including 222 and 666).
37 Heaven - 37-centric factoids from Tom Magliery.
73939133 - Shows what is special about the number.
About Big Numbers - Explores the world of big numbers, from thousand to googol. Identifies what objects in the universe, atoms to large scale structures, match these numbers.
All Numbers Are Interesting - Attempts to determine a unique property of each integer.
Catalan numbers - Enumeration of the Binary Trees
Favorite Mathematical Constants - An in-depth explanation of the most important math constants.
Heilbronn Triangle Constants - Heilbronn Triangle Constants
History of the Terms Google and Googleplex - 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.
Inverse Symbolic Calculator - A set of programs and specialized tables of mathematical constants dedicated to the identification of real numbers.
Math Constants - Various mathematical constants in Project Gutenberg's archives.
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.
One - A site dedicated to the number 1 and its significance on society
Pi squared over six - dedicated to the transcendental number pi squared over six
Plouffe's Inverter - Table of current records for the computation of constants
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.
The 17 page - Facts about the number 17: 17 in history, computing, astronomy, etc.

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