[Tutor] why?

[Robert William Hanks]

 Need ti find out whem a number o this form i**3+j**3+1 is acube.
 tryed a simple brute force code but, why this not work?

def iscube(n):
    cubed_root = n**(1/3.0)
    if round(cubed_root)**3 == n:
        return True
    else:
        return False

for i in range(1,10000000):
    for j in range(1,10000000):
         soma= i**3 +j**3 +1
         if isCube(soma):
             print i
             print j
             print soma
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