App description

Geometric series online calculator

If a sequence is from item 2, the ratio of each item to its predecessor is equal to the same constant, and the sequence is called an arithmetic sequence. This constant is called the ratio of the geometric series. The common ratio is usually represented by the letter q (q≠0), and the ratio is a1≠ 0. Note: When q=1, an is a constant column.

General formula:

\(an = [a1 q^{n-1}]\)

a1 - First item (a1):

n - Common ratio(q):

q - Geometric series：

Usage example

Input item number (n): 4

First item (a1): 1

Common ratio(q): 5

Click "calculate" to output the result

Geometric series： 125