Range

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Range[n]

returns a list of integers from 1 to n.

Range[a, b]

returns a list of (Integer, Rational, Real) numbers from a to b.

Range[a, b, di]

returns a list of numbers from a to b using step di.
More specifically, Range starts from a and successively adds increments of di until the result is greater (if di > 0) or less (if di < 0) than b.

Permutations
Reap