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Message: [QUOTE="Vance Heron, post: 4526140"] #! /usr/bin/env ruby def sum_dig_sq(ival) sum = 0 while ival > 0 do ival,dig = ival.divmod(10) sum += (dig * dig) end return sum end def happy?(ival) # sad #s from [URL]http://mathworld.wolfram.com/HappyNumber.html[/URL] sad = [0, 4, 16, 20, 37, 42, 58, 89, 145] rank = 0 while true do return -1 if sad.include?(ival) # check sad 1st - ~87% are sad ival = sum_dig_sq(ival) return rank if ival == 1 rank += 1 end end if ARGV[0].to_i <= 0 warn "usage: #{$0} <number>\n number must be > 0" exit end processed = [] happiest = [] (0..ARGV[0].to_i).each {|cur_num| base = cur_num.to_s.split('').sort.join.to_i processed[base] = happy?(cur_num) unless processed[base] rank = processed[base] next if rank < 0 puts "#{cur_num} is happy - rank #{rank}" happiest[rank] = cur_num unless happiest[rank] } happiest.each_with_index do |val, ndx| puts "Happiest number of rank #{ndx} is #{val}" end [/QUOTE]