A sequence is a set of numbers, which are identified by their position in the set. That is to say, there is a function mapping the counting numbers {1, 2, 3, ... } to the set. The counting numbers may include 0.
There may or may not be a rule governing the numbers. For example, a random sequence, by definition, should have no rule.
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A sequence is a function with domain a set of successive integers
12345678987654321
They are a sequence of numbers and each sequence has a term number.
It is the number 9.
the interval between numbers in a sequence