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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