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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) 217 is the smallest odd pseudoprime base five. 47 and 89 are primes, as is their concatenation (4789). Inserting the lowly 0 between them transforms the prime into a power, i.e. 47089, the square of 217. [Trotter]
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