yuuki · August 12, 2012 08:40
diff --git a/euler21.rb b/euler21.rb
 def d(n)
  t = (2..Math.sqrt(n).floor).select{|i| n % i == 0}
  ([1] + t + t.map{|i| n/i}).inject(:+)
 end

 amicable_num = (2...10000).select do |a|
  b = d(a)
  a == d(b) and a != b
 end
 puts amicable_num.inject(:+)
 # 31626
	def d(n)
	t = (2..Math.sqrt(n).floor).select{\|i\| n % i == 0}
	([1] + t + t.map{\|i\| n/i}).inject(:+)
	end

	amicable_num = (2...10000).select do \|a\|
	b = d(a)
	a == d(b) and a != b
	end
	puts amicable_num.inject(:+)
	# 31626
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