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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) 673 is the second prime to divide more than one number of the form p#  1 (673 divides both 149#  1 and 193#  1). 673 divides 3333333331. [Benney] The Louvre Pyramid is made up of 673 glass lozenges and triangles, not counting the doors. Chlorophyll a fluoresces at 673 nanometers. The smallest prime adjacent to any 3perfect number. [Loungrides] 673 = 1(mod 6) = 1(mod 7)= 1(mod3). [Bergot] There are 673 numbers N with no two same digits, having the property that when the sum of the k leftmost digits of N is divided by k the result is always an integer. [Post and Dale] Professor David Broadhurst's favorite titanic prime is zeta(673)/zeta(1). The only nontitanic prime of the form 337*2^n1.
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