|Number of cells||7|
|Discovered by||John Conway|
|Year of discovery||1970|
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
The 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 B34ej5y6n/S23, it is an oblique quadratic replicator, one of only a few known.
- In B36n/S2-i36c7c, it evolves into a glide-symmetric 9c/70 diagonal spaceship.
- B-heptomino at Eric Weisstein's Treasure Trove of Life
- B-heptomino at the Life Lexicon