Semi-cenark

A semi-cenark is either of two semi-Snark variants discovered by Tanner Jacobi in November 2017.[1] The name is due to the initial converter, which produces a century output for every two input gliders. The minimum safe repeat time is 43 ticks for the smaller initial catalyst shown in CC semi-cenark and CP semi-cenark, or 42 ticks with the slightly larger catalyst variant shown below.

<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html>x = 37, y = 37, rule = B3/S23 obo$b2o$bo7$9bobo$10b2o$10bo$13bo$14b2o$13b2o$29bo$27b3o$26bo$26b2o3$ 22bo$14b2o7b2o2bo6b3o$14bo2bo4b2o2bobo7bo$12b2o2b2o8b2o7bo$11bo2b2o$ 11b2o3b2o$16bobo$17bo$34b2o$32bo2bo$21b2o9b3o$22bo6bo$19b3o7b4o$19bo 12bo$31bo$31b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 2 HEIGHT 480 X 7 Y 5 THEME 6 GPS 20 LOOP 50 ZOOM 16 AUTOSTART ]]<html></code></div></div><canvas width="200" height="300" style="margin-left:1px;"><noscript></html>
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There is also the possibility of overclocking at period 36, 38, or 39. The reset glider can be followed immediately by a new trigger glider, as shown above, so the minimum repeat time for an intermittent stream of gliders is only 36 + 14 = 50 ticks.

The semi-cenarks were part of a series of new stable pulse dividers (the others being the tremi-Snark and the quadri-Snark) which collectively ranked third place in the Pattern of the Year 2017 competition on the ConwayLife.com forums, behind Tanner's p46 and the 2-engine Cordership.[2]

Also see
gollark: Why? Heating armour and weapons and stuff?
gollark: Or use some other magic thing to "see" inside them, if that counts.
gollark: Well, you can still heat up their outside bit. Or argue that you can see some parts of their body which shouldn't be filled with water. Or command their skeleton if they have an exposed broken bone somehow.
gollark: smh not using radians
gollark: If you are significantly hotter than this you might have coronavirus, in which case you should self-isolate.

References
  1. Tanner Jacobi (November 3, 2017). Re: Execution of Old Guns by Variable-Speed Firing Squad (discussion thread) at the ConwayLife.com forums
  2. Dave Greene (February 19, 2018). Re: Pattern of the Year 2017 -- votes (discussion thread) at the ConwayLife.com forums
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