Find the smallest prime number dividing the below sum.
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
Since we want to find the smallest prime dividing the sum, we start with the smallest prime number and move up. Many of them make mistake that 1 would be be answer because 1 is not a prime number. S first, we try 2.
Notice that 3 1 1 and 5 1 3 are both odd, so their sum must be even. This means that 2 must divide 3 1 1 + 5 1 3 , and so since 2 is the smallest prime, our answer must be 2.