56713...35243 (38-digits)

This number is a prime.

                                   56713727 8201564105 7722910123 8628035243

+ Wagstaff primes related to 'The New Mersenne Conjecture' are the indices of perfect numbers in a list of centered 9-gonal numbers; this one being the largest. [Homewood]

(There are 2 curios for this number that have not yet been approved by an editor.)

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