2351

This number is a prime.

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Twenty-three fifty-one (23:57) is the largest prime on a 24-hour clock, in hours and minutes, that is also prime when displayed on a 12-hour clock (11:51) [Corrected by weihong] [Homewood]

Submitted: 2018-05-26 13:42:33;   Last Modified: 2020-06-03 13:55:50.
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