🛠️ Invention or technique

Middle-square method

Método del medio del cuadrado

Date
1946 · confidence low
Place
Los Alamos, New Mexico, United States
Credited to
John von Neumann
Field
Knowledge & symbols

What it is

A method for generating pseudorandom numbers that squares a seed number and extracts the middle digits of the result as the next number in the sequence, proposed by John von Neumann for simulations on early computers.

What it led to

  • used in the earliest Monte Carlo calculations at Los Alamos
  • revealed the limitations of deterministic random-number generators
  • a precedent for later congruential pseudorandom generators

Links

Sources✓ verified 2026-09-28