49689...15327 (7465-digits)

This number is a prime.

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

2327*2^24786-1 is prime. Note that the digits of 2327 and 2327^2 = 5414929 both alternate in parity. Also, 24786 is a right-truncatable Harshad number. [Earls]