51116...13101 (141-digits)

This number is a prime.

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

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

Submitted: 2026-04-10 18:32:00; Last Modified: 2026-04-11 19:44:02.