15801...84731 (48-digits)

This number is a prime.

                        15801434 3936441708 9489233170 8830835465 7418884731

The largest known prime 13-tuplet (as of 2009) starts with this prime: 61571*107# + 4803194122972361 {+ 0, 2, 6, 8, 12, 18, 20, 26, 30, 32, 36, 42, 48}. [Andersen]