2305843009213693951

This number is a prime.

                                                        230584300 9213693951

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Russian priest and mathematician Ivan Mikheevich Pervushin discovered in 1883 that Marin Mersenne's famous list was mistaken to exclude 261-1 = 2305843009213693951. It was known for a while as "Pervushin's number."

Submitted: 2010-12-07 17:14:10;   Last Modified: 2010-12-14 13:22:23.
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