2203
This number is a prime.
The smallest prime average of two successive perfect powers.
The only known Mersenne prime exponent of the form
nextprime(3^n) for some positive integer n (here n = 7),
where nextprime(x) is defined as the smallest prime greater
than x. [Wang]
The sequence of digits '2203' does not appear in 2^2203 - 1. [Harrison]
(There is one curio for this number that has not yet been approved by an editor.)
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