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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits)
2351^ 2351 ends with the digits 2351; There are 6907 digits
in 2351! Note that 6907 is prime.
Twentythree fiftyone (23:51) is the largest prime on a 24hour clock, in hours and minutes, that is also prime when displayed on a 12hour clock (11:51) [Homewood]
(There is one curio for this number that has not yet been approved by an editor.)
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