Akademik

(mathematics) a progression in which each term is multiplied by a constant in order to obtain the next term

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1-4-16-64-256- is the start of a geometric progression

geoˌmetric proˈgression [geometric progression] (also geoˌmetric ˈseries) noun

a series of numbers in which each is multiplied or divided by a fixed number to produce the next, for example 1, 3, 9, 27, 81

compare ↑arithmetic progression