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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) The sum of the sum of digits of the first 18 primes , where each is powered by the corresponding prime number , is prime (i.e., 2^2 + 3^3 + 5^5 + 7^7 + 2^11 + 4^13 + 8^17 + 10^19 + ... + 8^53 + 14^59 + 7^61). Interestingly the sum of digits of this prime is 263 (prime), the sum of digits of 263 is 11 (prime), and sum of digits of 11 is 2 (prime). [Suzanna]
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