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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) New Year's Eve 2019 will be a prime number day of form yyyymmdd. No, this year isn't what a prime curiologist would prefer it would be. Please check back in 2027. The smallest number (also a semiprime) that can be written in six ways as the sum of the squares of three primes. Can you find one or more of the examples? 2019^2^(9102)2018 is prime and sod(2019^2^(9102)2018) is an emirp [Sariyar] 2019 is a semiprime (3*673) but the concatenation of its factors in the two possible ways are primes: 3673 and 6733. [Rivera]
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