if you double it and then half it, you get the same number again.
Mind officially blown.
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36 is the smallest non-trivial number. It is both square and triangular.
It is the fact that 13*5 = 65.
Any already rational number
I think its 6.5 because if 3 is the number doubled then it would be 1.5 and add 5 to that makes 6.5
That '5' on the end of it makes it odd. It doesn't matterwhat the rest of the number is.