Enigma 31 December 2013 Facebook / Meta Twitter / X icon Linkedin Reddit Email Answer to 1775 Third symphony: The three numbers are 231, 273 and 435 The winner Ian Duff of North Berwick, East Lothian, UK Advertisement Sign up to our weekly newsletter Receive a weekly dose of discovery in your inbox. We'll also keep you up to date with New Scientist events and special offers. Sign up