Sequence Calculator
Compute the nth term and sum of arithmetic or geometric sequences.
Input Data
Type
A1
Diff
N
Results
The nth term and/or sum.
14
Explanatory note about the result.
第 5 項 = 14；前 5 項和 = 40。
At a glance:Arithmetic: a_n = a1+(n−1)d. Geometric: a_n = a1·r^(n−1). Complements arithmetic-seq and geometric-seq.
Formula
arithmetic: a_n = a1 + (n−1)d.
geometric: a_n = a1·r^(n−1).
How to Use
- Pick a type and enter a1, diff/ratio and n.
- The tool returns the term/sum.
Case Studies
arithmetic a1=1,d=2,n=5
a5 = 9.
FAQ
Which to use?
Arithmetic adds a constant; geometric multiplies by a constant.
Related Tools
References
Content review: Calculatorism Science Team. Results are for reference only; please refer to the relevant authorities for the official figures.