727

This number is a prime.

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

Probably the only palindromic prime that can be expressed by the form n!+(n+1). [Silva]

727 starts the first chain of four palindromic primes, each formed from the previous one in forward and reverse order: 727, 72727, 727272727, 72727272727272727. [Silva]

The sum of the first five three-digit primes with midlle digit zero. [Silva]