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(just those submitted by Gupta)
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Just showing those entries submitted by 'Gupta': (Click here to show all)

Jason Funk © 2002
+ The only triangular number which is prime. [Gupta]

+ 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]

+ pi(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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