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Arithmetic sequence
Find the nth term and sum of an arithmetic sequence.
Enter the first term a, common difference d and number of terms n. The tool returns a + (n−1)d for the last term and n(first + last)/2 for the sum.
How to use
- Enter your text, values, or image.
- Adjust the options and run the tool.
- Copy or download your result.
Worked example
Example input
First term: 2 Common difference: 3 Number of terms: 5
Example result
{
"nth": 14,
"sum": 40
}Limitations and details
The term count must be an integer from 1 to 10⁹; only constant differences are modeled, and large values can lose numeric precision.
Inputs and options
- First term
- Number
- Common difference
- Number
- Number of terms
- Number · Minimum: 1 · Maximum: 1000000000
Frequently asked questions
Is this tool free and private?
Yes. All 300 tools are free in this phase. Processing happens in your browser; your input and files are not sent to our servers.