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@TheBrick(Tommy)
Some good one's I've book marks
http://www.math.hmc.edu/funfacts/ffiles/10002.5-8.shtml
http://www.math.hmc.edu/funfacts/ffiles/10001.4-5.shtml
http://www.math.hmc.edu/funfacts/ffiles/30001.1-2-8.shtml