8647
This number is a prime.
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8647 is the only 4-digit prime that is 2 less than a square
(8649 = 93^2) and 1 more than a triangular number (8646 is
the 131st triangular number). [Keith]
Submitted: 2023-12-16 21:35:35; Last Modified: 2023-12-17 21:40:07.
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