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5^2 = 25

(5 - 1)! + 1 = 4! + 1 = 24 + 1 = 25

25 divides 25 and so 5 is a Wilson prime.

13^2 = 169

(13 - 1)! + 1 = 12! + 1 = 479001600 + 1 = 479001601

169 divides 479001601 (= 2834329) so 13 is a Wilson prime.

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10y ago

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