The book is now available! 4252
(another Prime Pages' Curiosity)
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+ There are six (a perfect number) ways to insert arithmetic signs between the digits of 4252 that result in a prime: 4^2+5^2, 4-2+5-2, 4+2+5+2, 4+25+2, 4*2+5-2, and 4*2-5+2. [Jevtic]




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