Additional Factorial Set
There is only one Additional Factorial Set, which is 6.
The factors of 6 are 1, 2, 3, and 6.
If you add all factors except the last (which is the same as the resulting factored answer), you receive the same answer (6).
1+2+3 = 6;
2 + 3 = 5; 5 + 1 = 6;
So far, 6 is the only number that is able to do this.

