145P20
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| 145P20 | |||||||||
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| Pattern type | Oscillator | ||||||||
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| Number of cells | 145 | ||||||||
| Bounding box | 28 × 21 | ||||||||
| Period | 20 (mod: 20) | ||||||||
| Heat | 72.8 | ||||||||
| Volatility | 0.60 | 0.18 | ||||||||
| Kinetic symmetry | -c | ||||||||
| Discovered by | Noam Elkies | ||||||||
| Year of discovery | 1995 | ||||||||
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145P20 is an unnamed period-20 oscillator. It was the first non-trivial period 20 oscillator to be found,[note 1] and was discovered by Noam Elkies on March 22, 1995.[1]
It works by using sparks from three period-4 middleweight emulators and the period-5 middleweight volcano to hassle a traffic light predecessor. The middleweight emulator on the left can be replaced with a middleweight volcano.
Notes
- ↑ A nontrivial period-20 oscillator, such as heavyweight emulator on octagon II, could have been constructed from two oscillators of lower period (such as p4 and p5), both of which were known by an earlier date. However, no such LCM oscillators were attested prior to the discovery of this oscillator in 1995.
References
External links
Categories:
- Patterns
- Oscillators with between 140 and 149 cells
- Periodic objects with minimum population between 140 and 149
- Patterns with between 140 and 149 cells
- Patterns found by Noam Elkies
- Patterns found in 1995
- Outer-totalistically endemic patterns
- Oscillators
- Oscillators with period 20
- Oscillators with mod 20
- Oscillators with heat 72
- Oscillators with volatility 0.60
- Oscillators with strict volatility 0.18
- Oscillators with -c symmetry
- Unnamed periodic objects