2309
This number is a prime.
The only known primorial prime of a palindromic prime. Note
that (2309, 2311) is the third twin primorial prime
pair. [Loungrides]
The first occurrence of a prime number of integers between
the smaller and larger terms of an amicable
pair.
The smallest number which leave remainders p-1 in each case when divided by the primes p up to 11. [Perrenoud]
(There is one curio for this number that has not yet been approved by an editor.)
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