693

This number is a composite.

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

693 is the index of smallest prime p such that the concatenation of 1000 consecutive primes beginning with p is prime, i.e., p(693).p(694).p(695)...p(1692) is prime. Note that the resulting prime contains 4463-digits. [Firoozbakht]