Arithmetic Sequence/Series v1 - TI-83/83+ By: MysticFear Email: mysticfear@mail.com Website: http://netware.cjb.net Language: TI-83/83+ BASIC It can solve for 5 variables: A1, An, D, N, Sn You have to input 3 of the variables to get the other 2 variables I have tried this program many times and if you given it the right variables for each specific variable it will give display the correct answers. The source is open if you want to edit it for some reason.