Tomaž Kaštrun • 6/7/2026

Little useless-useful R functions – Ulam Prime Spiral

This article presents an R function for creating the Ulam Prime Spiral, a mathematical visualization where integers are arranged in a spiral and prime numbers are highlighted. The function supports customizable themes (Cosmic, Blueish, Classy, Psycho), optional number display for small grids, and animation. It includes a prime number sieve and generates a spiral matrix with directional logic. The article includes code examples, visual outputs, and links to the full GitHub repository. It is a technical tutorial focused on R programming and data visualization.

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#data visualization #prime numbers #number theory