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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) 444444444 is the only ninedigit repdigit such that the product of itself and all truncations of itself minus one is prime. I.e., 444444444*44444444*4444444*444444*44444*4444*444*44*4  1 is prime. There are no such tendigit repdigits. [Opao]
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