Arithmetic sequence


A number pattern in which there is a common difference between successive terms.


Example


3

6

9

12

15


Here the common difference is +3


3

+3

6

+3

9

+3

12

+3

15


Formula


You can find the nth term of an arithmetic sequence using the formula



where d = common difference.


Test the formula on the 4th term of the example sequence

 


Related topics:

Number sequences

Geometric sequence