51116...13101 (141-digits)

This number is a prime.

                                                                           5
1116131411 5111114141 6871411171 7161920131 6141613221 3141319231 4161614171
3141714202 3101116171 9202023232 3111320132 0171910191 3141620101 0131013101

The longest initial prime number substring formed by concatenation of the sums of digits of Honaker primes. [Harrison]