The book is now available! 2221771
(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 prime 2221771 that remains prime for D=4 to 9 in 2D2D2D1D7D7D1. The primes thus obtained are: 2424241474741, 2525251575751, 2626261676761, 2727271777771, 2828281878781, 2929291979791. [Bajpai]

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