Foretelling The Next Cicada SwarmNumber Theory Level 3
The state of Kansas only gets 2 broods of Magicicada. The first brood last appeared in 1998, and has a life cycle of 17 years. The second brood last appeared in 2011, and has a life cycle of 13 years. (It is now 2014.) How many years will it take for both broods to emerge together?