Let's say we have whole numbers from 2 to 31 (imagine them as blocks). We also have a number that is not divisible by two of those numbers that are next to each other on the number line but that number is divisible by the other numbers.
For example, we have only three numbers 2, 3 and 4 and want to find just one that cant divide some number that those others can, for example, the number 6 which cant be divided by 4(in this example there are multiple answers but in the actual problem just one).
What are those two numbers? Our maths teacher gave us this problem in the 5th grade and it's still bugging me. Can somebody explain it, please?