Homework SourseCicadas are winged insects which spend most of their time be
Cicadas are winged insects which spend most of their time below ground.
They emergence is synchronized with periods of years which are usually prime numbers.
Two groups of cicadas would emerge during the spring of their 13th and 17th years, constructing an exit tunnel.
Group 1 emerges every 13 years and Group 2 emerges every 17 years.
Group 1 last emerged in 2016 and Group 2 last emerged in 2015.
In what year will both groups emerge at the same time for a big conference?
Solution
Group 1 emerges every 13 years and Group 2 emerges every 17 years.
Group 1 last emerged in 2016 and Group 2 last emerged in 2015.
So, both groups emerge at the same time for a big conference : 13*17 = 221 years
i.e. year 2237
