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  • \$\begingroup\$ Sorry, little confusion between me and Zach on the question. Everything should be formatted right now. \$\endgroup\$ Commented Sep 24, 2015 at 22:17
  • \$\begingroup\$ A useful observation: in a confidant number, each digit is one plus double the previous digit, except the second digit is instead one plus the first digit. \$\endgroup\$ Commented Sep 24, 2015 at 23:14
  • \$\begingroup\$ Going columnwise reveals another (possibly) useful pattern ;) \$\endgroup\$ Commented Sep 25, 2015 at 0:41
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    \$\begingroup\$ In the example, why is CD not in the list? Since all other combinations where the second digit is one more than the first digit are listed, I don't understand why CD does not qualify. \$\endgroup\$ Commented Sep 25, 2015 at 4:50
  • \$\begingroup\$ That was an accident :P Fixed, thanks for pointing it out. \$\endgroup\$ Commented Sep 25, 2015 at 13:26