Chükö

Pell numbers

A positive Pell number belongs to the sequence P(0) = 0, P(1) = 1, P(n) = 2P(n - 1) + P(n - 2). Zero is excluded here.

The first few pell numbers are: 2, 5, 12, 29, 70, 169, 408, 985, 2378, 5741, 13860, …

16 of the first one million positive integers are pell.

Learn more about pell numbers on wikipedia.

See other features.