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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)

+ 14 is the smallest semiprime whose reversal is a prime. [Gupta]

+ The smallest impossible value of Euler's Phi function. [Gupta]

+ 1!*2!*3!*4!*5!*6!*7!*8!*9!*10!*11!*12!*13!*14! + 1 is prime. [Gupta]

+ 14^14 plus the 14th prime is prime. Other smaller examples are 1, 2 and 4. [Gupta]




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