LCM(13,17) = 221.

For the first time in 221 years, two broods of periodic cicadas will emerge, early in the summer.

In 2024, the Midwest is expected to see the result of two cicada broods in the Spring: one that comes out every 13 years and another every 17 years.

The two broods, Brood XIX and Brood XIII last emerged simultaneously in 1803.

Amazing how that math works, isn't it?  "Central Illinois is expected to be an overlap zone of cicada activity as both Brood XIX and Brood XIII are expected to emerge in the billions."  Those broods generally hatch early in summer, whilst the annual cicadas show up during the dog days.  As will, the way Lotke and Volterra demonstrated, the annual cicada's predators.

[O]ne critter who will miss all the action is the insects’ natural enemy: the large Cicada Killer Wasp.

The cicada killer is one of the largest wasps in the United States, with females growing to a size of 2 inches in length.

The females have stingers their male counterparts lack. They use this stinger to sting and paralyze cicadas with their venom. Then, they carry the helpless insects back to their burrow and lay their eggs among their bodies, according to The Smithsonian.

The paralyzed cicadas remain alive to feed the emerging young.

Entomologists suggest that the long-period cicadas demonstrate a survival strategy expressed in prime-number years as it's harder for a long-lived (by insect standards) predator to crack that code.  I wonder if the life cycles of the annual cicadas and the large wasps also reflect those dynamics.  No doubt any early-hatching predator wasps stumbling across some of those big thirteen or seventeen year cicadas will have a feast for their spawn.  The spawn, growing to maturity, will be disappointed.

We'll see what sort of summer din manifests itself here; there are plenty of tree frogs and the annual cicadas sounding off in August.