This is the hexagon with digits to each row and diagonal which follow the rule :
- If the row and diagonal contains 5 triangles, it must contains all of the digits from 1 to 5.
- If the row and diagonal contains 7 triangles, it must contains all of the digits from 1 to 7.
There are many arrangement to create such hexagon.
Replace each letter with numbers, which obey the rules.
I have put some numbers to some letter there, to make the puzzle unique.
Note : I think my wording is still a bit confusing, please edit it, for better puzzle.