Group size
2
3
4
5
Group sum
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Included
1
2
3
4
5
6
7
8
9
X
Excluded
1
2
3
4
5
6
7
8
9
X
Result:
12
Digits:
1
2
3
4
5
6
7
8
9