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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) The American Civil War (also known as the War Between the States) started in 1861. Did you know there are exactly 18 primes less than or equal to 61? [Greer] The smallest prime formed from the sum of the squares of the first n not primefree numbers, in this case, for n = 8 we have: 4^2 + 8^2 + 9^2 + 12^2 + 16^2 + 18^2 + 20^2 + 24^2 = 1861. [Post] The smallest prime whose the reversal is a concatenation of two composite squares. [Loungrides] There are no known (probable) primes of the form 186{1} (i.e., 186111...111) other than 1861. [Luen]
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