- 8 - Wikipedia
8 is a composite number and the first number which is neither prime nor semiprime By Mihăilescu's Theorem, it is the only nonzero perfect power that is one less than another perfect power 8 is the first proper Leyland number of the form xy + yx, where in its case x and y both equal 2 [4] 8 is a Fibonacci number and the only nontrivial Fibonacci number that is a perfect cube [5] Sphenic
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