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madcaptenor
on Dec 5, 2023
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Most 2 digit numbers not divisible by 2, 3, or 5 a...
I've heard this as 91 is the smallest (or only two-digit) composite number that "looks prime".
hiAndrewQuinn
on Dec 5, 2023
[–]
That's a really good way to put it, it's the only one I might reliably trip up on.
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