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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ 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]




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