Math Tools
Recursive Sequence Calculator
Generate recursive sequence terms from a starting value and a simple recursive rule.
Recursive Sequence Calculator
Generate terms of a recursive sequence from a starting value and a simple recursive rule.
Each term is found by adding a constant to the previous term.
Recursive formula
a₁ = 2
aₙ = aₙ₋₁ + 3
Results
Nth term
29
Sequence
2, 5, 8, 11, 14, 17, 20, 23, 26, 29
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What this calculator does
A recursive sequence defines each term using the previous term. This calculator generates terms from a starting value and a simple recursive rule such as adding or multiplying by a constant.
What is a recursive sequence calculator?
A recursive sequence calculator is a math tool that generates the terms of a sequence from a starting value and a recursive rule. Instead of finding every term by hand, you can enter the first term, choose the recursive pattern, and instantly build the sequence.
This is useful for algebra, pre-calculus, sequence and series practice, homework, exam review, and checking whether a recursive rule creates an arithmetic-style or geometric-style pattern.
Recursive sequence formula and rule types
Add constant
This creates a sequence where the same number is added each time.
Example rule: aₙ = aₙ₋₁ + c
Multiply by constant
This creates a sequence where each term is multiplied by the same number.
Example rule: aₙ = aₙ₋₁ × r
Previous term plus constant
This uses the previous term directly and adds a fixed value to get the next one.
Example rule: aₙ = aₙ₋₁ + k
Add constant recursive sequence examples
These examples show how the selected recursive rule builds a sequence term by term.
| First term | Parameter | Example sequence |
|---|---|---|
| 2 | 3 | 2, 5, 8, 11, 14 |
| 10 | 4 | 10, 14, 18, 22, 26 |
| -1 | 5 | -1, 4, 9, 14, 19 |
Generated recursive sequence term table
This table lists the term number and value for the sequence you entered.
| n | Term value |
|---|---|
| 1 | 2 |
| 2 | 5 |
| 3 | 8 |
| 4 | 11 |
| 5 | 14 |
| 6 | 17 |
| 7 | 20 |
| 8 | 23 |
| 9 | 26 |
| 10 | 29 |
How to find the nth term of a recursive sequence
To find the nth term of a recursive sequence, start with the first term and repeatedly apply the recursive rule until you reach the desired term number. For example, if the first term is 2 and you add 3 each time, the sequence becomes 2, 5, 8, 11, and so on.
This calculator automates that process by generating the sequence up to the number of terms you choose. It then shows the final term as the nth term and also displays the full list of generated values.
Recursive sequence vs explicit sequence
A recursive sequence uses one term to define the next term. That means you need the starting term and rule to build the sequence step by step. An explicit sequence, by contrast, gives a direct formula for the nth term without needing previous terms.
Recursive formulas are common in algebra because they show how a pattern grows from one step to the next. Explicit formulas are useful when you want to jump directly to a distant term.
When a recursive sequence calculator is useful
An online recursive sequence calculator is useful for students learning arithmetic and geometric patterns, teachers preparing examples, and anyone checking recursive formulas for homework or exam practice.
It is especially helpful when you want to verify terms quickly, compare different rules, or understand how changing the starting value or constant affects the entire sequence.
Recursive sequence calculator FAQ and common questions
What is a recursive sequence in math?
A recursive sequence is a sequence where each term is defined using the term before it. You need a starting term and a recursive rule to generate the rest of the sequence.
How do you solve a recursive sequence?
Start with the first term, then apply the recursive rule again and again to generate the following terms. This calculator performs that process automatically.
What is the recursive formula for an arithmetic sequence?
A common recursive formula for an arithmetic sequence is a₁ as the starting value and aₙ = aₙ₋₁ + d, where d is the common difference.
What is the recursive formula for a geometric sequence?
A common recursive formula for a geometric sequence is a₁ as the starting value and aₙ = aₙ₋₁ × r, where r is the common ratio.
What does a₁ mean in a recursive sequence?
a₁ means the first term of the sequence. It is the starting point from which all later terms are generated.
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