Fast Primes

[SMcNeill]

Note -- it takes just fractions of a second to calculate the primes. The vast majority of time here is spend on PRINT statements. 

I couldn't run your program because of the error. I know that my program isn't particularly fast, but it's probably the easiest way to determine prime numbers.
I think I found that in the math dictionary.

The _OrElse isn't an error.  It's just a case of you needing to upgrade your version of QB64PE.