39938

There are only 2 sequences that function together.There is also a pattern which is add 2 and after that minus 2 so you can make another sequence if you have done 1 sequence.

I found the sequences by finding the combinations for 15.Then I took all the combinations and continued till I found out about the sequences that work.

These are all the combinations of 15:

14+1
13+2
12+3
11+4
10+5
9+6
8+7

These sequences function together:

6,9,11,12,4,14,7
8,7,13,10,6,12,9