41996139943

This number is a prime.

                                                                4 1996139943

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

                    3419961399433
                   334199613994333 
                  33341996139943333
                 3333419961399433333
                333334199613994333333
                999994199613994399999
                 9999419961399439999
                  99941996139943999   
                   994199613994399
                    9419961399439

Each of the above ten numbers is prime. 41996139943 is the smallest prime with this property. [Firoozbakht]