The book is now available! 123457
(another Prime Pages' Curiosity)
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+ When you remove the penultimate (next to the last) digit of 123457 you will end up with yet another prime. Repeat the process for four more primes. [Brod]

+ The smallest prime formed from the first six imperfect numbers in order. [Beedassy]

(There is one curio for this number that has not yet been approved by an editor.)

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