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 The On-Line Encyclopedia of Integer Sequences (OEIS) This mathematical resource, provided by the OEIS Foundation and authored by Neil J.A. Sloane, contains a searchable database of integer sequences along with information about classic integer sequences and puzzles. The main table is a collection of number sequences arranged in lexicographic order of absolute values. Each sequence entry contains the beginning integers, name, description, formula,... http://oeis.org/
 The Prime Pages This excellent metasite for prime numbers is mind-boggling, not only in terms of the quality of information provided, but also in the breadth and variety of the hyperlinks, from discourse on the Riemann hypothesis to programs and freeware for calculating Mersenne primes. Dr. Chris Caldwell, creator of the Graph Theory Tutorial Website of the University of Tennessee at Martin, has provided local... http://primes.utm.edu/
 An Introduction to the Theory of Numbers Written by Leo Moser and presented by the Trillia Group, this virtual text introduces visitors to the theory of numbers. After agreeing to the terms and conditions of use, users will be able to download the full document as an 87-page pdf file in either large or regular print. The chapters include: "Compositions and Partitions," "Irrational Numbers," "Diophantine Equations," and "Geometry of... http://www.trillia.com/moser-number.html
 Gaussian Primes This is an introduction to Gaussian primes, complex numbers with integers for real and imaginary parts that are divisible by themselves and 1, but no other complex numbers with integer coefficients. This shows calculations of the first few Gaussian primes. http://mathforum.org/library/view/10580.html
 MAA NumberADay How much can you really learn from one number a day? Quite a bit actually, and this fun feature from the Mathematical Association of America (MAA) may prove to be rather addictive. Posted daily since September 2008, the MAA posts a number (for example, the number 11,185,272) and then offers a selection of that number's properties. Visitors to the site can click on some of the external links, look... http://maanumberaday.blogspot.com/
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