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The nth Prime Page will now find any of the first 2.623˙10^{15} primes or
π(x) for x up to 10^{17}. 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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