These are the square numbers: 1, 4, 9, 16, 25, 36, 49, 64, 81...
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A linear pattern.
Un = 4(n-1) where n = 1, 2, 3, ...
1/2 then 1/4 1/8 1/16 1/32
Square root of -1 is an imaginary number (√-1 = i), √-16 = √-1 * √16 √-16 = i * 4 √-16 = 4 i
As a mixed number it is simply: 1 and 3/16