197137

This number is a prime.

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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]

Submitted: 2012-07-21 05:20:41; Last Modified: 2019-03-20 14:37:28.