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Woodall numbers

A Woodall number is a positive integer of the form n * 2^n - 1 for a positive integer n.

The first few woodall numbers are: 7, 23, 63, 159, 383, 895, 2047, 4607, 10239, 22527, 49151, …

15 of the first one million positive integers are woodall.

Learn more about woodall numbers on wikipedia.

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