OFFSET
2,2
EXAMPLE
Grouping by sum gives:
2: 1
3: 2
4: 3 1
5: 4
6: 5 2 1
7: 6
8: 7 3 1
9: 8 2
10: 9 4 1
11: 10
12: 11 5 3 2 1
13: 12
14: 13 6 1
15: 14 4 2
16: 15 7 3 1
17: 16
18: 17 8 5 2 1
MATHEMATICA
Table[Divide@@@Select[IntegerPartitions[n, {2}], Divisible@@#&], {n, 2, 30}]
KEYWORD
nonn,tabf
AUTHOR
Gus Wiseman, Nov 03 2022
STATUS
approved