This number is a prime.

+ The largest five-digit prime contains all square digits. [Bajpai]

+ All twin primes up to a million can be expressed as P = 2n^2 - Q, where P is the larger of any twin prime pair and Q is the larger of another twin prime pair. [Homewood]

+ The largest five-digit prime. [Afzal]

(There is one curio for this number that has not yet been approved by an editor.)

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