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    \$\begingroup\$ +1 for the justification "Because they are only 16 characters in hexadecimal, your code will need to be as short as possible." \$\endgroup\$ Commented Dec 19, 2015 at 18:29
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    \$\begingroup\$ A test case that passes through a zero digit (which is an important edge case for my current approach): 749699 -> B7083 -> 27083 -> 69CB -> 6932 -> 1B14 -> 1214 -> 4BE -> 425 -> 1A9 -> 119 -> 77 \$\endgroup\$ Commented Dec 19, 2015 at 18:53
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    \$\begingroup\$ Test case 153. Step 1 > 99, Step 2 --> 99, Step 3 --> 63, output 63. Correct? \$\endgroup\$ Commented Dec 21, 2015 at 12:09
  • \$\begingroup\$ Yes for 153 I had not seen the code Flow explanation... \$\endgroup\$ Commented Jan 30, 2019 at 9:51
  • \$\begingroup\$ For what it's worth... 3 out of the top 4 answers return 99 on input 153 and Dennis's seg-faults on the current version of Jelly. I'm going to quit testing while I'm ahead :) Are we sure that example is correct? \$\endgroup\$ Commented Jan 31, 2019 at 4:31