Definition:Ulam Number

Definition

The sequence of Ulam numbers is defined as:

It begins $1, 2, 3$

Each new term is the next to be uniquely the sum of $2$ previous terms in the sequence.

Sequence of Ulam Numbers

The sequence of Ulam numbers begins as follows:

$1, 2, 3, 4, 6, 8, 11, 13, 16, 18, 26, 28, 36, 38, 47, 48, 53, 57, 62, 69, \ldots{}$

Also see

• Results about Ulam numbers can be found here.

Source of Name

This entry was named for Stanisław Marcin Ulam.

Sources

• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $11$