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Suppose 13-years and 17-year, anc cicadas both appear this year. When will both typed of cicadas next appear together?

User Jpiasetz
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Well, the least common multiple of 13 and 17 is 221.

The 17th next appearance of the 13-year cicadas,
and the 13th next appearance of the 17-year ones,
will occur in 221 years from now.

User Pnichols
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