2,4,7,14,16
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81 is the only one.
9 . . . the square of 3.The next one is the square of 4 . . . 16 .
If a is any number, then a squared = (-a) squared, so one might say that a and -a are both square roots of a squared. However, the square root symbol always means the positive square root.
sqrt(151) = 12.28820573.... It would suggest that it is IRRATIONAL.
The integer that is a perfect square, perfect cube, and perfect fifth power is 64. This is because 64 is equal to 8^2, 4^3, and 2^6, making it a perfect square, cube, and fifth power. It is the only integer between 2 and 200000000000000 that satisfies all three conditions.