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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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