A perfect number is an integer that equals the sum of its positive proper divisors—or the sum of its divisors excluding itself. For example, 28 is perfect because 1+2+4+7+14 = 28.
An e-perfect number is an integer that equals the sum of its positive proper e-divisors. For example, 36 is e-perfect because 6+12+18 = 36.
Write a function that returns the nth e-perfect number.
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