Definition:Ulam Number
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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): $11$