P29 pre-pulsar shuttle

Pre-pulsar shuttle 29
x = 18, y = 27, rule = B3/S23 11b2o$11bo$13bo$9b5o$9bo$12b4o$12bo2bo2$bo$obo6b3o4bo$bo7bobo3bobo$9b 3o3bobo$16bo2$16bo$9b3o3bobo$bo7bobo3bobo$obo6b3o4bo$bo2$12bo2bo$12b4o $9bo$9b5o$13bo$11bo$11b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 5 ZOOM 10 LOOP 29 ]]
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Pattern type	Oscillator
Oscillator type	Shuttle
Number of cells	54
Bounding box	28 × 28
Period	29
Mod	29
Heat	41.5
Volatility	0.90
Strict volatility	0.90
Discovered by	David Buckingham
Year of discovery	1980
Rules Outer-totalistic rules B3/S23 – B3/S2378 # of rules 22 = 4 Isotropic rules B3-k/S23-ck – B35ck6ek7/S234ckyz5kqr6ei78
Glider synthesis Fewest gliders 31† Catagolue-generated RLE synthesis †Can be constructed with 15 gliders using the reverse caber tosser universal constructor.
Pattern files Plaintext prepulsarshuttle29.cells RLE prepulsarshuttle29.rle
Identifiers apgcode xp29_y8ca23z252y24eexcczg8gy28ssy366xg0s4z01y76e6x6e6w11zzy8252y1252 Pentadecathlon ID 54P29.1

Pre-pulsar shuttle 29 (or prime^{[citation needed]}) is a period 29 shuttle oscillator discovered by David Buckingham on August 2, 1980, making it the first oscillator of that period to be found. In terms of its 54 cells it is the smallest known period 29 oscillator. The oscillator works by combining the 15-generation, two-tub pre-pulsar shuttle mechanism used in Eureka with a 14-generation pre-pulsar shuttle mechanism. Hassling pre-pulsars in this way was the only known way of constructing period 29 oscillators until the discovery of the p29 traffic-farm hassler, and some variations of this shuttle are shown below. In September 1994 Bill Gosper found that two copies of pre-pulsar shuttle 29 could be used to hassle a pentadecathlon. Gosper used it to construct the p58 toadsucker.

A 42-glider synthesis is known for a variant of this oscillator, 56P29, which is shown below.

Image gallery

Generation 4 reveals two pre-pulsars (black) being hassled by a 15-generation mechanism (green) and a 14-generation mechanism (red).

A slightly larger version of this oscillator, 56P29, with just one pre-pulsar (black) and an alternate 14-generation stabilization (red) RLE: here

A much larger version of this oscillator with four pre-pulsars RLE: here

See also

• Pre-pulsar shuttle oscillators

External links

• P29 pre-pulsar shuttle at Adam P. Goucher's Catagolue

• 56P29 at Adam P. Goucher's Catagolue

• 54P29.1 at Heinrich Koenig's Game of Life Object Catalogs