Web Reference: In this lesson, we are going to find a solution in Ruby for a complex problem from Project Euler (problem #21) that asks: Evaluate the sum of all the amicable numbers under 10000. Clear as mud right? Essentially, you take a number, identify all its divisors and add them together to get a value. Implement the amicable number algorithm in Ruby and solve this Project Euler question. Go through the Ruby implementation and solution for Problem #21 here: ... Feb 22, 2016 · 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.
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