If $\displaystyle a, b \in \mathbb{N}$ and $\displaystyle 2 \leq b \leq a$, then $\displaystyle a!+b$ is composite. Can I get some help with this?

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- Sep 10th 2009, 12:38 PMdori1123composite numbers
If $\displaystyle a, b \in \mathbb{N}$ and $\displaystyle 2 \leq b \leq a$, then $\displaystyle a!+b$ is composite. Can I get some help with this?

- Sep 10th 2009, 12:52 PMdori1123
Never mind, I got it.