17232...21737 (42-digits)

This number is a prime.

                              17 2320297537 1066811891 2733401392 9612221737

+ 172320297537106681189127334013929612221737 is formed from the ordered concatenation of the primes produced from 1705+18^n, where n = 1 to 7 is prime. [Petrov]

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