SOLUTION: what is the largest prime less than 500?

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Question 3299: what is the largest prime less than 500?
Answer by drglass(89) About Me  (Show Source):
You can put this solution on YOUR website!
To find factors of a number N it is enough to search the odd numbers from 3-sqrt%28N%29. The table below whether or not a number is a factor of 499 by checking whether or not 499/n has a remainder (you will need to scroll down to see the table).
nremainder
3yes
7yes
13yes
17yes
19yes
21yes

Since 499 has no factors, it must be prime. I skipped some possible values like 5 and 9. Do you know why?