The book is now available! 2305843009213693951
(another Prime Pages' Curiosity)
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The nth Prime Page will now find any of the first 2.623˙1015 primes or π(x) for x up to 1017.

                                                        230584300 9213693951
+ 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 five-dollar bill using pennies, nickels, dimes, quarters, half-dollar, 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 261-1 = 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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