18961109

This number is a prime.

Just showing those entries submitted by 'Bajpai': (Click here to show all)

+ 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]

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