8.
Details:
8 = 2^3 (a cube)
8+1 = 9
9 = 3^2 (a square)
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eight ( 8 )
eight
LOL, there isn't any!
There are two answers 1 and 64
8 is the only one I can think of it's 2^3 and it's one less then 9 (3^2) hope this helps =D