The book is now available! 31313...32323 (108-digits)
(another Prime Pages' Curiosity)
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                                   31313131 3131313131 3131313131 3131313131
3131313123 2323232323 2323232323 2323232323 2323232323 2323232323 2323232323
+ Twenty-three 31's followed by thirty-one 23's is prime. [De Geest]




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