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EDIT by dvgrn:: replaced triple backticks with [pattern] tags to enable LifeViewer.
The patterns
P503 (12 cells):
Code: Select all
x = 5, y = 5, rule = B3/S23
ob3o$bob2o$2obo$5$b2o2$Code: Select all
x = 5, y = 5, rule = B3/S23
ob3o$o3bo$bo2bo$2o3$2obo$The finding
Both patterns were found independently during a multi-threaded random search over 5×5 bounding boxes (C++, infinite sparse-grid simulator, ~300 patterns/second). They evolve completely independently for their first 22 generations, then converge at generation 23 to the same attractor: **four beehives in a symmetric cross** (population 24, bounding box 13×13, D4 symmetry), displaced by dr=−1, dc=+1.
Lifespans confirmed in Golly 5.0 on an infinite grid:
- P503: ~4,928 generations
- P160: ~4,726 generations
- Both: final state pop=24, fully static
For reference, the R-pentomino lives 1,103 generations — both of these live roughly 4.3–4.5× longer.
Population trajectory (selected generations):
| Gen | P503 | P160 |
|-----|------|------|
| 0 | 12 | 13 |
| 5 | 8 | 8 |
| 18 | 56 | 40 |
| 20 | 24 | 56 |
| 22 | 24 | 24 |
| 23 | 24 | 24 | ← canonical match |
**Final state (ASCII, 13×13):**
Code: Select all
......O......
.....O.O.....
.....O.O.....
......O......
.............
.OO.......OO.
O..O.....O..O
.OO.......OO.
.............
......O......
.....O.O.....
.....O.O.....
......O......
Broader context
In a full convergence analysis of 608 Methuselahs found in the same search, 360 distinct attractors were found — meaning 41% of patterns share an attractor with at least one other pattern. The 4-beehive cross is the 6th most common attractor, with 10 patterns total converging to it (including P503 and P160).
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Happy to share the search code or the full results file. Would appreciate if someone with wiki access could create a page, or point me to the right place to document this.
Thanks!