2107015501

This number is a prime.

Nine primes are obtained by progressively intertwining the digit 3 into the prime 2107015501, i.e., 231307015501, 2313037015501, 23130373015501, 231303730315501, 2313037303135501, 23130373031353501, 231303730313535301, 2313037303135353031. [Rivera]