Large prime oscillator
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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 with a period that is a Mersenne prime with 13,395 digits (244497-1).
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.