4397
This number is a prime.
Comet Hale-Bopp is predicted to return in the year 4397. The Heaven's Gate cult claimed there was an alien spaceship following behind it.
The smallest prime such that it and the next two primes (4409 and 4421) are all congruent to 5 (mod 12). [Nie]
(There are 2 curios for this number that have not yet been approved by an editor.)
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