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This topic happens to be Project Euler problem #92. https://projecteuler.net/problem=92 https://projecteuler.net/problem=92

• arconis987 9y ago
  A similar problem was in Google Code Jam 2009 :) https://code.google.com/codejam/contest/188266/dashboard https://code.google.com/codejam/contest/188266/dashboard
  • jwilk 9y ago
    Archived copy, which works with JS disabled: https://archive.is/2pPTN https://archive.is/2pPTN
    • nayuki 9y ago
      Error 503 Service Unavailable Service Unavailable Guru Meditation: XID: 363037244 Varnish cache server
• labster 9y ago
  You can compete against other code golfers for the shortest Happy Numbers solution on code-golf.io https://code-golf.io/happy-numbers https://code-golf.io/happy-numbers