Google Sheets Conditional Formatting Cycle

In Google Sheets I would like to color a cell depending on if the cycle is on or off.

The cycle is for 10 day the cycle is ON then for 5 days the cycle is OFF then repeat.

So if I start the cycle on Jan 1. The cycle would be ON from Jan 1 - Jan 10 then OFF from Jan 11- Jan 16 then ON from Jan 17 - Jan 27 then OFF from Jan 28 - Feb 1 then continue with this pattern for the year or forever.