A sole divisor
Number Theory
Level
3
Bored in class, I randomly scribbled down a 2-digit integer on a piece of paper. Then I realized that the number had the following properties:
- It is not divisible by any integer from 2 to 11 inclusive, except for 7.
- It is not a perfect square.
What is this 2-digit integer?
The answer is 91.
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