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Is there any other number than 24 with this property, or is 24 the only one?

Well, 2 also has the property: multiply any prime number other than 2 with itself, subtract one, and it's a multiple of 2. This one is quite obvious, all those prime numbers are odd, so of course if you subtract one of their square (which is also odd), it's even and a multiple of 2.

But is there any other than 24 and 2? Is there one larger than 24?



The other numbers are 3 and 4. This is what yields 24. I think the comment above [0] explains this well.

[0] https://news.ycombinator.com/item?id=7839666


The article also mentions 6, 8, and 12 (all factors of 24).




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