ULAM SPIRAL // the hidden architecture of primes

Plotted: 0 Primes: 0 Density: 0% Largest:
Prime
Composite

Stanislaw Ulam, 1963
Primes cluster on diagonals
defined by quadratic polynomials
"I was doodling during a talk
 and I started writing numbers
 in a spiral pattern..."
 — Stanislaw Ulam