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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) Wonder Book of Strange Facts (Ripley's Believe It or Not, Inc., 1957, p. 100) states that this (the 9th Mersenne prime) is the number of ways to make change for a fivedollar bill using pennies, nickels, dimes, quarters, halfdollar, and dollar coins. The correct answer is 98411, making this one of the largest prime errors ever found. [Rupinski] Russian priest and mathematician Ivan Mikheevich Pervushin discovered in 1883 that Marin Mersenne's famous list was mistaken to exclude 2^{61}1 = 2305843009213693951. It was known for a while as "Pervushin's number."
(There is one curio for this number that has not yet been approved by an editor.)
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