151

This number is a prime.

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

151 - 1!*5!*1!, 151 + 1!*5!*1!, 151*1!*5!*1! - 1, & 151*1!*5!*1! + 1, are all primes. Note that 151151 has the same property. [Firoozbakht]