3215031751
This number is a composite.
The strong k-pseudoprime test for k = 2, 3, 5, 7, correctly identifies all primes below 2.5 x 10^10 with only one exception, i.e., 3215031751 = 151*751*28351. [Rivera]
(There is one curio for this number that has not yet been approved by an editor.)
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