- For other uses of "cloverleaf", see Cloverleaf (disambiguation).
Achim's p4 (or cloverleaf) is a period 4 oscillator that was found in a less compact form (using two sombreros) by David Buckingham in 1976. The form shown here was found by Achim Flammenkamp in 1988. The rotor is two copies of the rotor of 1-2-3-4, so the oscillator is sometimes called the dual 1-2-3-4.
Achim's p4 is about the twenty-third most common naturally-occurring oscillator in Achim Flammenkamp's census.
In October, 2010 Lewis Patterson found a predecessor of this oscillator that allows a 7-glider synthesis.
The original, less compact form of Achim's p4
- ↑ Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
- Achim's p4 at Eric Weisstein's Treasure Trove of Life