Click on the numbers that will become prime numbers if a 1 is removed.
Example: Removing the '1' in '31' leaves '3', so this would count. On the other hand, removing the '1' from '216' leaves '26', which is not prime, so this would not count. (For numbers with more than one '1', remove just one of them.)
Clickable: Select answers by clicking on text or image buttons
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