59,961

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Number

$59 \, 961$ (fifty-nine thousand, nine hundred and sixty-one) is:

$3 \times 11 \times 23 \times 79$

The $25$th and largest known integer $n$ after $3$, $4$, $5$, $6$, $7$, $8$, $10$, $15$, $19$, $41$, $59$, $61$, $105$, $160$, $661$, $2653$, $3069$, $3943$, $4053$, $4998$, $8275$, $9158$, $11 \, 164$, $43 \, 592$ such that $m = \ds \sum_{k \mathop = 0}^{n - 1} \paren {-1}^k \paren {n - k}!$ is prime

Also see

• Previous: Sum of Sequence of Alternating Positive and Negative Factorials being Prime