Mold on pentadecathlon

Mold on pentadecathlon is a period-60 oscillator composed of a mold and a pentadecathlon. Although it is composed of two oscillators of smaller periods (4 and 15 respectively), it is considered non-trivial, because it has a single cell that is alive in generation 5 and is dead in the other 59 phases of the oscillator. In terms of its 24 cells it is the smallest known period 60 oscillator.

Mold on pentadecathlon
<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html>x = 10, y = 13, rule = B3/S23 2bo4bo$2ob4ob2o$2bo4bo5$6bobo$9bo$5bo2bo$4bobobo$4bo2bo$5b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] <nowiki>#C [[ GPS 15 LOOP 60 THUMBSIZE 2 ]]</nowiki> <html></code></div></div><canvas width="200" height="300" style="margin-left:1px;"><noscript></html> <html></noscript></canvas></div></html>
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Pattern type Oscillator
Number of cells 24
Bounding box 16×16
Period 60
Mod 60
Heat 29.4
Volatility 0.93
Strict volatility 0.01
Discovered by Unknown
Year of discovery Unknown
Generation 5 reveals the single cell that oscillates at the full period (in green).
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See also
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