B-heptomino
| B-heptomino | |||||||
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| Pattern type | Methuselah | ||||||
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| Number of cells | 7 | ||||||
| Bounding box | 4 × 3 | ||||||
| Lifespan | 148 generations | ||||||
| L/I | 21.1 | ||||||
| Discovered by | John Conway | ||||||
| Year of discovery | 1970 | ||||||
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The B-heptomino is a very common methuselah that evolves into three blocks, two gliders and a ship after 148 generations. Compare with Herschel, which appears at generation 20 of B-heptomino's evolution. It often arises with the cell at top left shifted one space to the left, which does not affect the subsequent evolution. B-heptominoes acquired particular importance in 1996 due to David Buckingham's work on B tracks.
It is considered a failed spaceship, but can be used to make a puffer 2.
In other rules
B-heptomino is a stable puffer in many rules.
In B3/S23-e4e, it evolves into a (16,5)c/74 knightship.
In B3/S23-a, it is a glide-symmetric 10c/20 spaceship.
In the rule B34ej5y6n/S23, it is an oblique quadratic replicator, one of the few of these known.
Image gallery
Generation 20 of the B-heptomino
Generation 148 of the B-heptomino
A 6-cell parent of the B-heptomino
See also
External links
- B-heptomino at the Life Lexicon