The book is now available! 4567
(another Prime Pages' Curiosity)
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+ The only prime number with four consecutive increasing digits. [De Geest]

+ The smallest non-trivial straight-line prime. [Pol]

+ The only 4-digit esthetic prime, i.e., a prime whose the difference between adjacent digits is 1. [Loungrides]

+ 4567, 4^4 + 5^5 + 6^6 + 7^7 + 4567, 4^4 + 5^5 + 6^6 + 7^7 + 4567 + 4*5*6*7, and 4567 +/- 4*5*6*7 are all prime. [Bui Quang Tuan]




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