18961109
This number is a prime.
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The smallest Sophie Germain prime p containing all the
invertible digits that becomes a Honaker prime q when
turned upside down. Curiously, p and q can be expressed as
the sum of two squares, viz., (4265^2 + 878^2) and (7591^2
+ 1580^2) respectively. [Bajpai]
Submitted: 2018-12-18 16:35:27; Last Modified: 2020-06-16 13:41:39.
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