Eureka
| Eureka | |||||||||
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| Pattern type | Oscillator | ||||||||
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| Oscillator type | Shuttle | ||||||||
| Number of cells | 28 | ||||||||
| Bounding box | 18 × 15 | ||||||||
| Period | 30 (mod: 15) | ||||||||
| Heat | 22.4 | ||||||||
| Volatility | 0.91 | 0.91 | ||||||||
| Kinetic symmetry | Unspecified | ||||||||
| Discovered by | David Buckingham | ||||||||
| Year of discovery | 1980 | ||||||||
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Eureka (or p30 pre-pulsar shuttle) is a period-30 pre-pulsar shuttle oscillator in which two 15-generation pre-pulsar shuttle mechanisms each composed of two tubs hassle a pre-pulsar. It was found by David Buckingham on August 16, 1980.[1] A slightly different period-30 shuttle can be created by shifting the top half of the shuttle two cells to the left or right (see below). This allows the outermost tubs to optionally be replaced by blocks.
The first known semi-natural appearance of a version of this oscillator was in November 2014 in a soup found by Adam P. Goucher using apgsearch.[2] The monomerised version first occurred in March 2016.[3] A fourfold skewed version appeared in a soup by Charity Engine on February 5, 2022.[4]
Gallery
 Generation 1 of Eureka, which shows that the object being hassled is a pre-pulsar |
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References
- ↑ Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
- ↑ Adam P. Goucher (November 25, 2014). Re: Soup search results (discussion thread) at the ConwayLife.com forums
- ↑ praosylen (March 20, 2016). Re: Soup search results (discussion thread) at the ConwayLife.com forums
- ↑ David Raucci (February 5, 2022). Message in #cgol on the Conwaylife Lounge Discord server
External links
- Eureka at the Life Lexicon
- 28P30.1 at Heinrich Koenig's Game of Life Object Catalogs
Variants
Categories:
- Patterns
- Oscillators with 28 cells
- Periodic objects with minimum population 28
- Patterns with 28 cells
- Patterns found by David Buckingham
- Patterns found in 1980
- Patterns that can be constructed with 11 gliders
- Oscillators
- Shuttles
- Oscillators with period 30
- Oscillators with mod 15
- Oscillators with heat 22
- Oscillators with volatility 0.91
- Oscillators with strict volatility 0.91
- Patterns with bilateral orthogonal symmetry
- Flipping oscillators
- Sparkers
- Sparkers with period 30
- Strong sparkers
- Semi-natural periodic objects
- Pre-pulsar shuttle oscillators