Pentadecathlon on Thumb 1 is a period 45 oscillator composed of a pentadecathlon and thumb 1. Although it consists of two oscillators of smaller periods (15 and 9 respectively), it is considered non-trivial, because it contains a single cell that oscillates at the full period. In terms of its 48 cells, it is the smallest known non-trivial period 45 oscillator.
5 reveals the single cell that oscillates at the full period (in green).
- 48P45.1 at Heinrich Koenig's Game of Life Object Catalogs