Number Sequence Calculator - calculatorguides

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CalculatorGuides

Calculate terms, sums, and preview sequence progressions

Formula: a_n = a₁ + d × (n - 1)
Example: 1, 3, 5, 7, 9, 11, 13, ...

First Number (a₁):

Common Difference (d):

Nth Number to Obtain (n):

Formula: a_n = a₁ × r^n-1
Example: 1, 2, 4, 8, 16, 32, 64, 128, ...

First Number (a₁):

Common Ratio (r):

Nth Number to Obtain (n):

Definition: a₀ = 0, a₁ = 1, a_n = a_n-1 + a_n-2
Example: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, ...

Nth Term Index (n):

Error

Nth Term Result

• Sum of First N Terms (S_n):
• Sequence Preview (up to term n):