X! Produces a westward stream of lightweight spaceships representing prime numbers: a LWSS escapes past the pentadecathlon around generation 120n+100 if and only if n is prime.
Source: wiktionary
Pentadecathlon
Synonyms for "pentadecathlon"
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The speed was very dependent on the number of live cells, but it ran the pentadecathlon at 92 gen/sec in the last version I measured.
Source: wiktionary
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.