The book is now available! 168809
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ The smallest invertible Sophie Germain semiprime n, containing all of the invertible digits that yields a different Sophie Germain semiprime m when rotated by 180 degrees. As such, {n, (2*n+1)}; {m, (2*m+1)}, i.e., {168809, 337619} and {608891, 1217783} all are semiprime. Curiously, n is also expressible as the sum of two squares in two different ways: (80^2 + 403^2) and (220^2 + 347^2). [Bajpai]

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