55350776431903243

This number is a prime.

                                                          5535077 6431903243

Farideh Firoozbakht at the University of Isfahan, Iran, conjectured (circa 1982) that (p_n)^{1/n} decreases as n increases (here p_n is the nth prime). This has been tested up to p_n = 55350776431903243.