961

This number is a composite.

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In the Fermat's diophantine quadruple {1, 3, 8, 120}, one more than the product of any two terms is a prime square. The prime squares produced are {4, 9, 25, 121, 361, 961}. [Gudipati]

Submitted: 2026-05-07 16:34:07; Last Modified: 2026-05-07 19:30:08.