Large prime oscillator
A large prime oscillator is any oscillator with a relatively small bounding box whose period is a very large prime. (If the bounding-box restriction is removed, then eight gliders travelling in a four-Snark loop would provide a trivial example for any chosen prime.) The first such oscillator was built by Gabriel Nivasch in 2003. The current record holder is an oscillator constructed by Adam P. Goucher in 2009 with a period that is a Mersenne prime with 13,395 digits (244497-1).[note 1]
The next higher Mersenne-prime oscillator, period 286243-1, could be constructed with semi-Snarks and would actually be smaller than the current record holder, but as of the end of 2017 the construction of this pattern has not yet been completed.
- This oscillator can be found in Golly's Very Large Patterns collections, accessible via Help › Online Archives › Very Large Patterns › Mersenne-44497.
- Adam P. Goucher. 13395-digit prime-period oscillator (discussion thread) at the ConwayLife.com forums