descr=%{
    Let d(n) be defined as the sum of proper divisors of n (numbers less than n which divide evenly into n).
    If d(a) = b and d(b) = a, where a ≠ b, then a and b are an amicable pair and each of a and b are called amicable numbers.

    For example, the proper divisors of 220 are 1, 2, 4, 5, 10, 11, 20, 22, 44, 55 and 110; therefore d(220) = 284. The proper divisors of 284 are 1, 2, 4, 71 and 142; so d(284) = 220.

    Evaluate the sum of all the amicable numbers under 10000.
}

def d(n)
    sum=0
    (1..n/2).each do |i|
        if n % i == 0
            sum += i
        end
    end
    return sum
end

h={}
(1..10000).each do |n|
    h[n]=d(n)
end

sum=0
h.each do |n,m|
    if h[m] == n && n != m
        puts "#{m}\t#{n}"
        sum+=n
    end
end
puts sum