Question 9815
You may also use the following formula {{{tn=a+(n-1)(d)}}} where tn is your term number that you are trying to find, a is the first number of the sequence, n is the number of which the term in order (ex 17 is n#2 and 22 is n#3)  and d is the common difference (d=t2-t1) This formula is more helpful for trying to find say, the 800th term.