require 'scanf'

arr = []
for i in 100..999
	ei = i
	ei_arr = ei.to_s.split('').map(&:to_i)
	if ei%11 == 0 and ei/11 == ei_arr.inject{|sum,n| sum+((n.to_i)**2)}
		arr << ei
	end
end

puts arr

Line 6: wrong argument type Symbol (expected Proc) (TypeError)
	from t.rb:4:in `each'
	from t.rb:4