1553
This number is a prime.
The number of ways of seating nine people around a circular table so that no one sits next to any of his neighbors in a previous seating order. [Post]
The sum of the squares of the first nine odd non-composite numbers. [Silva]
The smallest prime which can be represented as a sum of two
squares of a prime and its reversal (232+322). [Poo Sung]
(There are 3 curios for this number that have not yet been approved by an editor.)
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