39717...98317 (27-digits)

This number is a prime.

                                               3971783 2971415953 4771298317

+ This prime is formed from the concatenation in order of all the primes 397, 1783, 2971, 4159, 5347, 7129, 8317, that are also concatenated from two primes summed to a hundred, i.e., (3, 97), (17, 83), (29, 71), (41, 59), (53, 47), (71, 29), (83, 17). [Loungrides]

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