14682887281

This number is a prime.

                                                                1 4682887281

The numbers 1429, 1428571429, 1428571428571429... form a sequence equal to (10^(6n+4)+3)/7. 14682887281 is the largest prime factor of the first composite number in this sequence (it has the factorization 157*601*1031137*14682887281).