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# Integer sequences

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## Definition

Formally, an *integer sequence* is a function (possibly partial^{[1]}) from nonnegative integers
to integers:

Ideally, it should have been defined for all nonnegative integers or at least for all natural numbers ,
but in some cases the definition is only partial^{[1]}, for example, if the offset is greater than 1, or when the sequence is finite.

## Notes

- ↑
^{1.0}^{1.1}Partial function — Wikipedia.org.