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Given an integer, output a truthy value if it is the same upside-down (rotated 180°) or a falsy value otherwise.
0, 1, and 8 have rotational symmetry. 6 becomes 9 and vice versa.
Sequence of numbers producing truthy results: OEIS A000787
0, 1, 8, 11, 69, 88, 96, 101, 111, 181, 609, 619, 689, 808,...