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    212 has an index of 3, there's no index 2. Commented Sep 20, 2013 at 7:26
  • Thanks. I missed that point. I was actually wondering why my answer was different from yours. Commented Sep 20, 2013 at 7:28
  • My answer was based on randomly picked numbers for the example. Commented Sep 20, 2013 at 7:31
  • @Stefan: Thanks for pointing that out. I added a 2. Its 00:30 here and I need some coffee. Or sleep. Commented Sep 20, 2013 at 7:34