x = 18, y = 22, rule = B3/S23 b2o$b2o2$bo$obo$o2bo2b2o$4bob2o$2b2o4$8b2o$3b2o2b2obo5b2o$3b2o3bobo5b 2o$10bo$12bo2$12bo$10bo$3b2o3bobo5b2o$3b2o2b2obo5b2o$8b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 7 THUMBSIZE 2 ZOOM 12 HEIGHT 400 LOOP 42 ]]
Unix on 34p14 shuttle is the smallest known period 42 oscillator. It consists of a unix and a 34p14 shuttle whose sparks interact so that one cell in the middle oscillates at the full period.