Well, 3 is definitelyĭivisible by 1 and 3. And 2 is interestingĪny other even number is also going to beĭivisible by 2, above and beyond 1 and itself. That color for the- I'll just circle them. It in a different color, since I already used Two natural numbers- itself, that's 2 right there, and 1. So 2 is divisible byġ and by 2 and not by any other natural numbers. So 1, although it might beĪ little counter intuitive is not prime.
Of our definition- it needs to be divisible byĮxactly two natural numbers. So you might say, look,ġ is divisible by 1 and it is divisible by itself. And if this doesn'tĮxamples here, and let's figure out if some Want to say exactly two other natural numbers,īecause one of the numbers is itself. One of those numbers is itself,Īnd the other one is one. It is a natural number divisibleīy exactly two numbers, or two other natural numbers. It is a natural number- and a natural number, onceĪgain, just as an example, these are like the numbers 1, 2,ģ, so essentially the counting numbers startingĪt 1, or you could say the positive integers. What encryption means, you don't have to worryĪbout it right now. That your computer uses right now could beīased on prime numbers.
Your mathematical careers, you'll see that there's actuallyįairly sophisticated concepts that can be built on top of
