The book is now available! 991
(another Prime Pages' Curiosity)
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Participate: 		+ 991, 99991, and 9999991 are each prime. [Avrutin]

+ This number, as well as 331 and 661, are all prime. Note that the product of these three primes is a Carmichael Number. [Patterson]

+ The largest three-digit permutable prime.

+ 991^2 = 982081 and 982 + 0 + 8 + 1 = 991. [Meller]

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