the bugs are singing and the joint is hopping

The conjunction of two broods of cicadas is going on now. It is called a super-brood. One brood has a 13 year cycle, and the other brood has a 17 year cycle. Using maxima, one can calculate the number of years for this conjunction with the least common multiple function.

(%i1) load("functs");
(%o1) /usr/share/maxima/5.41.0/share/simplification/functs.mac
(%i2) lcm(13,17);
(%o2) 221

The combined cycle is 221 years! This last happened in 1803.

(%i3) 2024-221;
(%o3) 1803

dead cicadas from brood of 2024
dead cicadas from the super brood of 2024

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