351
This number is a composite.
351!3 - 1 is a multifactorial prime with prime digital sum. [Patterson]
The sum of the first four Honaker numbers equals the 26th triangular number (351). Are any other triangular numbers the sum of the first n Honaker numbers? [Gaydos]
(There is one curio for this number that has not yet been approved by an editor.)
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