30849...58441 (34-digits)

This number is a prime.

                                       3084 9350093102 7513297515 9556758441

The concatenation of the first twenty composite numbers divided by (4 + 6 + 8 + 9 + 10 + 12 + 14 + 15 + 16 + 18 + 20 + 21 - 1) is prime. [Wesolowski]