9 lines
204 B
Python
9 lines
204 B
Python
'''
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let x = y + d, z = y - d
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then x**2 - y**2 - z**2 = n can be written b**2 - 4bd + n = 0
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so b = 2d +- sqrt(4 * d**2 - n)
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let t**2 = 4 * d**2 - n, then (2d + t) * (2d - t) = n
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'''
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def dual_factor(num):
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