54P17.1 is an unnamed period-17 oscillator. It was the first period 17 oscillator to be found, and was discovered by Dean Hickerson on April 27, 1997. In terms of its 54 cells, it had been the smallest known period 17 oscillator for 17 years until discovery of honey thieves in September 2014. It has one well-known variant, 71P17.1, which is shown below. This oscillator is related to 42P10.1.
A related unnamed period 17 oscillator, 71P17.1RLE: here
- 54P17.1 at Heinrich Koenig's Game of Life Object Catalogs