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This number is a prime.
53465*2^27272-1 is prime. This is the first prime at the Prime Curios! site to have between 8000 and 8999 digits. Note that 27272 is a smoothly undulating number. Also, when you sum the squares of the digits of 53465*2^27272-1 you get the prime 234743. [Earls]
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