Jolson (also known as Al Jolson) is a period 15 oscillator consisting of two blocks hassled by two pentadecathlons. It was found by Robert Wainwright in November 1984 and named by Bill Gosper. A period 9 version that uses two snackers instead of pentadecathlons is also possible (see below), but p14 (by hitting the sides of the pentadecathla with 34P14 shuttles) is not possible. It is not possible to create a period 45 version by using one snacker and one pentadecathlon, however, as the sparks must be both present at the same time when hassling.
One of the phases of Jolson, which led to its name
- 42P15.1 at Heinrich Koenig's Game of Life Object Catalogs
- Al Jolson at Wikipedia