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Thabit numbers

A Thabit number is an integer of the form 3 * 2^n - 1 for a non-negative integer n.

The first few thabit numbers are: 2, 5, 11, 23, 47, 95, 191, 383, 767, 1535, 3071, 6143, …

19 of the first one million positive integers are thabit.

Learn more about thabit numbers on wikipedia.

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