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Definition

General Term of a Sequence

The general term (also called the formula) of a sequence is the rule that defines the value of the term at any given position. It is written using subscript notation: ana_n represents the term in the nnth position, where nn is a counting number from the domain. For instance, instead of writing the function as f(x)=2xf(x) = 2x, the sequence notation uses an=2na_n = 2n. To find specific terms, substitute the appropriate counting number for nn and simplify. When n=1n = 1, a1=2(1)=2a_1 = 2(1) = 2; when n=2n = 2, a2=2(2)=4a_2 = 2(2) = 4; and so on.

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Updated 2026-05-25

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Intermediate Algebra @ OpenStax

Ch.12 Sequences, Series and Binomial Theorem - Intermediate Algebra @ OpenStax

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