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(another Prime Pages' Curiosity)
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Participate: 		+ Wilson's Theorem: Let p be an integer greater than one. p is prime iff (p - 1)! == -1 (mod p). [Nicholson]

+ Agoh's conjecture involves prime numbers and a minimal residue of -1.

+ pi(103) - floor(sqrt(29)*(1/1 + 1/2 + 1/3 + ... + 1/1000)) = -1 [Wesolowski]

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