PowerRange

PowerRange[b] generates the list {1, 10, 100, …, max}, where max is the largest power of 10 that does not exceed b.

PowerRange[a, b] generates the list {a, 10a, 100a, …, max}, with successive elements increasing by factors of 10.

PowerRange[a, b, r] uses factors of r instead of 10.

Examples

Powers of 10:

PowerRange[1000]
(* {1, 10, 100, 1000} *)

Powers of 2:

PowerRange[1, 100, 2]
(* {1, 2, 4, 8, 16, 32, 64} *)

Please visit the official Wolfram Language Reference for more details.