Don't use a chart for Construct 7, really...

[Frizze]

You have trouble adding 4+7+8+0+1 and seeing if that sum is divisible by 3?

The Rule for 3: A number is divisible by 3 if the sum of the digits is divisible by 3

They missed an opportunity with third test which would be slightly harder, but optional. You pass you get better buff you fail you die, but you can opt not to go for it.

While you can fairly quickly test for division by 3 4 or 5, knowing if your 47801 hp was a prime number or not isnt quite as easy.

Its not. 47801 is the product of primes 3677 and 13.

And while you can get to a multiple of 3 4 or 5 by adding no more then 4 to any given number, the gaps between primes are often larger.