I was initially thinking the same, but I don't think that's the case. This will help you find a small range of six potential primes (pick any element on the lef

I was initially thinking the same, but I don't think that's the case. This will help you find a small range of six potential primes (pick any element on the left edge of the triangle). But you're still required to calculate the factorizations on those six numbers to determine which of them are indeed prime.