23505...58213 (1975-digits)
This number is a composite.
As determined by Ray Chandler and Jonathan Vos Post, this is the largest known prime of the form:
(prime(n)-1)! + prime(n)^9
In this case, (prime(137)-1)! + prime(137)^9 =
(773-1) + 773^9.
No larger such prime has been found up to n = 150.
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