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Geometric progression 1, 4, 16, 64, 256 would seem to fit...
It is a geometric progression with common ratio 0.5
Ah, the geometric mean between 1 and 4 is like a little secret garden in the world of numbers. To find it, you simply multiply the two numbers together and then take the square root of that product. So, for 1 and 4, the geometric mean would be the square root of 4, which is 2. Just a happy little calculation to brighten your day.
16. Geometric mean of two numbers is the square root of their product.
√9x1=3