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(another Prime Pages' Curiosity)
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The hardware and software on this system was updated September 4th.  Please let me know of any problem you encounter. <caldwell@utm.edu>

+ The largest known number such that its sum of unitary divisors is prime. A divisor d of n is said unitary if gcd(d, n/d) = 1. Note that this number is a Fermat prime minus one. [Russo]




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