This number is a prime.

+ This prime P is a record-holder in that the smallest number y > 0 giving a solution to the Pell equation x^2 + Py^2 = 1 has 1115 decimal digits. [Post]

+ An invertible prime whose square (1000198009801) contains only invertible digits. The smallest prime with this property is 109. [Bajpai]

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