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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) Place 1 after the concatenation of the 9 digits duplicated and obtain a 19digit prime, whose sum of digits is the 91 appearing the end of the prime. [Silva] (1122334455667788991, 1122334455667788997) is a sexy prime pair formed by doubling each counting digit in order and attaching at the end respectively the digits 1 and 7. [Loungrides]
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