Ulam Numbers

The Ulam numbers (or u-numbers) are the sequence defined by , . For , is the least integer uniquely expressible as the sum of two distinct earlier terms. For example, if and , , , and ; because .
This Demonstration shows the Ulam sequence for , , and , highlighting the unique pair of terms that sum to .


  • [Snapshot]
  • [Snapshot]
  • [Snapshot]
    • Share:

Embed Interactive Demonstration New!

Just copy and paste this snippet of JavaScript code into your website or blog to put the live Demonstration on your site. More details »

Files require Wolfram CDF Player or Mathematica.