Chükö

Cullen numbers

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

The first few cullen numbers are: 3, 9, 25, 65, 161, 385, 897, 2049, 4609, 10241, 22529, 49153, …

15 of the first one million positive integers are cullen.

Learn more about cullen numbers on wikipedia.

See other features.