Specific Numbers Recreations Math

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.

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• 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.
  
• 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.
  
• Triangular Numbers - Properties of triangular numbers including reversible, happy, harshad, highly composite, deficient, abundant ones.
  
• Verbose.net - Dedicated to the natural order of the universe and to the irrational and logical chaos it presents.
  
• Mathemagic - Many minor miracles for magically-minded mathematicians!
  
• Sum Beastliness - Some simple mathematics associated with 666, the Number of the Beast.
  
• Golden Ratio and Fibonacci Numbers - Provides information about the golden ratio and Fibonacci numbers, and how they relate to biology, art, and ancient Egyptian art.
  
• Jewish Encyclopedia: Numbers and Numerals - Discusses the uses and symbolism of various numbers in Hebrew literature.
  
• Mathematical Constants and Computation - Essays, references, links, software.
  
• 37 Heaven - Collects information around the number thirty-seven.
  
• Wikipedia - Mathematical constant - A list of constants with links to more detailed information.
  
• 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.
  
• 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.
  
• FAQ on Special Numbers - Answers to Frequently asked questions about special numbers.
  
• World of Numbers - Includes a collection of randomly gathered numbers, curios, puzzles, palindromes and primes.
  
• 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.
  
• Indian numerals - Describes the history of the indian numeral system.
  
• 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
  
• Mathematical Constants - Stephen Finch has published a book of this title and here provides various supplementary materials.
  
• Vampire Numbers - Numbers with a factorization containing the same digits, e.g. 1530 = 30*51.
  
• Inverse Symbolic Calculator - A set of programs and specialized tables of mathematical constants dedicated to the identification of real numbers.
  
• Arabic numerals - Describes the history of the Arabic numeral system that is in use nearly all over the world today.
  
• 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.
  
• Catalan Number -- MathWorld - Illustration of the Catalan numbers related to Euler's polygon division problem.
  
• Number Gossip - Numerous special categories of numbers, searchable.
  
• 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.
  
• Fun With Numbers - Includes some lists of numerals, relating to basic operations performed on certain constants. Not updated since 1995.
  
  

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