197137

This number is a prime.

+ 197137=444^2+1 is the only prime of form n^2+1 concatenated in two ways, i.e., from three double-digit primes, (19, 71, 37), or two 3-digit primes (197, 137). [Loungrides]

Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell