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The only Fermat number which is also a triangular number. [Gupta] 3 is the only integer n such that n!+1 and n!1 are both primes. [Gupta] No rare number ending in 3 has ever been found. [Gupta] The only number (curiously prime) whose subfactorial is also prime. [Gupta] !3 + 1 is prime. Note that !3 represents subfactorial 3. [Gupta] 1!*2!*3! + 1 are twin primes. [Gupta] (3) = !3, where !3 denotes subfactorial 3. [Gupta] The floor function of phi^e = 3, where phi is golden ratio. [Gupta]
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