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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) 108 = 2^{2} * 3^{3} (the product of the first two primes raised to themselves). [Sladcik] The difference between the smallest (136) and second smallest (244) sums of squares (a^2 + b^2) where both a and b have more than one prime factor. [Hunter] 108 can be written as the sum of a cube and a square (a^3 + b^2) in two ways. [Hunter] The concatenation of 108 with its previous and next number is prime, i.e., 108107 and 108109 are primes. [Bopardikar] The smallest possible sum for a set of six distinct primes such that the sum of any five is prime: {5, 7, 11, 19, 29, 37}. [Honaker , Noe , Porter]
(There is one curio for this number that has not yet been approved by an editor.)
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