This number is a prime.

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The smallest invertible prime p containing all of the invertible digits that becomes a Sophie Germain prime q (6889901) when turned upside down. Curiously, p and q can be expressed as the sum of two squares, viz., (835^2 + 608^2) and (1901^2+1810^2) respectively. [Bajpai]

Submitted: 2018-12-16 07:16:03;   Last Modified: 2018-12-16 07:45:28.
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