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Just showing those entries submitted by 'Gupta': (Click here to show all) Any number with only two positive divisors is a prime number. [Gupta]The floor function of phi^phi = 2, where phi is Golden Ratio. [Gupta] !2 + 1 is prime. Note that !2 represents subfactorial 2. [Gupta] The smallest number and only prime such that prime(n)=sigma(n). [Gupta] Only prime whose sum of divisors is odd. [Gupta]
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