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Message: [QUOTE="Ã‰ric DUMINIL, post: 4525558"] Hi! I'd just like to post my isHappy? method: class Integer def isHappy? return to_s.split(//).collect{|digit| digit.to_i**2}.inject{|sum, n| sum + n }.isHappy? while self!=1 true rescue false end end puts 115485454654987986246476765451256546545241654555555555555555555555555555555555554125665146454122345444487.isHappy? true This method may return false negative (if happiness>maximum stack level), though I doubt no one will ever find one! Thanks for the quiz, Eric [/QUOTE]