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The smallest Sophie Germain prime P, containing all of the strobogrammatic digits {0, 1, 6, 8, 9}, yields another Sophie Germain prime Q when rotated by 180 degrees. Curiously, P and Q both are expressible as the sum of two squares. [Bajpai]

Submitted: 2019-06-08 00:47:53;   Last Modified: 2020-06-16 08:34:43.
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