1355297

This number is a prime.

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

1355297 = 1*11*111*1111 - (1 + 11 + 111 + 1111). Note that 1355297 is the only known prime of this form, and the next such prime (if it exists) has more than 72000 digits! [Firoozbakht]