14990...21993 (27-digits)

This number is a prime.

                                               1499071 1477627434 1482621993

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

149907114776274341482621993 is the concatenation in increasing order of the prime factors of 25!-1 and with 2 less forms a twin-prime pair. [Galliani]