This number is a prime.

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6648647 is a prime such that 6*648647+1, 66*48647+1, ... , 664864*7+1 are all prime numbers. Is it the largest with such property? Found by Adam Stinchcombe and Farideh Firoozbakht, 2003. [Rivera]

Submitted: 2018-09-08 11:12:55;   Last Modified: 2019-01-29 13:35:56.
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