Ha,when you write a paper,don't forget JJ (kidding).
I have to say something, I stand on Mr.Blue'shoulder,though I know some number theory.F(1,2,5,8)=73.n=-21,m=51.At first I am careless,the definition should be m-n+1,as 0 shoud be in it.You can ask Mr.Blue, check it.I have a bad hob,do questions without pen.I can play blind chess.Right now fall semester begins,I don't have time now.