a '3' and a '6' written close together
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36 is the square of 6.
How about: x-36 = 36 => x = 36+36 => x = 72
36•1 6•6
36 is the smallest non-trivial number. It is both square and triangular.
Because 6 squared equals 36 and 36 terminates, or ends, which makes it rational.