The book is now available! 7
(just those submitted by Gupta)
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Just showing those entries submitted by 'Gupta': (Click here to show all)

+ There are 7 letters in TUESDAY, which is the only day of the week whose name contains a prime number of letters. [Gupta]

+ The only prime whose sum of divisors (p+1) is a cube. [Gupta]

+ 1!*2!*3!*4!*5!*6!*7! + 1 are twin primes. [Gupta]

+ All multidigit Fermat numbers end in 7. [Gupta]

+ The pH value of pure water is 7. [Gupta]

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