Пример #1
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def d(n):
    #return sum(x for x in range(1, n//2 + 1) if not (n % x))
    return sum(properdivisors(n))
Пример #2
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def d(n):
    #return sum(x for x in range(1, n//2 + 1) if not (n % x))
    return sum(properdivisors(n))
Пример #3
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def isabundant(n):
    return sum(properdivisors(n)) > n