The book is now available! 8128
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:

+ The largest perfect number whose index is equal to the number of digits. [Pol]

+ The largest perfect number of the form 2^(p-1)*(2^p-1) where the prime number p and the perfect number both have the same index. [Pol]

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