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{{ printedBook.courseTrack.name }} {{ printedBook.name }} A sequence is either a finite or infinite list of numbers which are called terms. One example of a sequence is $1,4,7,10,13,…$ The dots imply that the sequence continues infinitely. The terms are often represented as $a_{1},$ $a_{2},$ $a_{3}$, and so on, where the numbers at the bottom right of the letters are called indices and specify the position of the terms in the sequence. In the example, $a_{1}=1,a_{2}=4,a_{3}=7,etc.$ Several terms can have the same value, even though this is not the case here. Two specific types of sequences are arithmetic sequences and geometric sequences.