I’m about the same place as you. I’m now trying to get 13dn. I have 2,4 or 5 for first digit, 1 or 3 for the second digit and 5 for the third digit. Can anyone confirm this? Very slow progress!
Agreed 17 ends 16 with dgt two 2,4 or 6 but I have 9 options starting 1-6. Agreed 13 starts 2,4 or 5. How do you get 18 ending 5? Have you solved 18? I have 4 options