19

This number is a prime.

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19 authors going back to Nicodemus are reported to have made the claim that the perfect numbers had units digits that invariably alternated between 6 and 8, until Pierrot Cataldi exploded the number-theoretical myth. [Dickson]

Submitted: 2020-02-02 01:56:15;   Last Modified: 2020-02-02 02:12:32.
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