Prime Curios!: 2196

2196
(another Prime Pages' Curiosity)

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(2⁷³³¹ - 1)/458072843161 is prime. This number has 2196 decimal digits and set a new record in 1997 for general purpose primality proving. It required 1 month of CPU on an Alpha 400 MHz. [Mayer and Morain]

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