This week's featured article

Primer is a pattern that was constructed by Dean Hickerson on November 1, 1991 that produces a stream of lightweight spaceships representing the prime numbers. N is prime if and only if a lightweight spaceship is above the honeycomb at the bottomleft corner of the pattern at generation 120N. It was the first pattern created that computes prime numbers, though others have since been constructed using the same ideas.
It works by using gliders to emulate a prime number sieve. Lightweight spaceships that move westward are deleted by gliders that represent positive integers if the lightweight spaceship represents a multiple of that number.

Pattern collection

The LifeWiki contains one of the most comprehensive catalogues of patterns available on the internet. Within it you will find:


Did you know...

 ... that as of November 2016 there are 161 different still lifes known to be constructible by colliding four gliders, but it is not known if the list is complete?
 ... that in 2014 a new natural infinite growth pattern was discovered, starting from a symmetric random starting configuration?
 ... that the first selfconstructing Conway's Life pattern was built in 2010?
 ... that the first glider synthesis for a c/3 spaceship was completed in 2014?
 ... that the first "macrospaceship" gun (a Gemini spaceship gun) was constructed in 2010, followed by the HBK gun in January 2015 and a Demonoid gun in December 2015?
 ... that the waterbear is the single known highspeed oblique spaceship, many orders of magnitude faster than Gemini spaceships and halfbaked knightships?
 ... that there are no known direct reflectors for lightspeed wire signals, or for signals in 2c/3 wires, but that very large reflectors for these signals can be constructed using stable or periodic circuitry?
 ... that 24 tencell patterns exhibit infinite growth, with 17 unique pattern types, but that it has been proven that no ninecell pattern exhibits infinite growth?
 ... that all still lifes up to 18 bits have a known glider synthesis, but it's still not known whether all still lifes are synthesizable.
 ... that the French kiss remained without a glider synthesis until 2013?

