Download the old prime tester

Old prime tester you can download this program and see how slow it would be If you had to test ever number one by one

Just enter a number up to 27 digits and click find next prime.

These are true prime number not Mersenne numbers.

to find Pairs or Triples just click box then press test button.

Download Prime Test

Code for Prime Test

You could speed it up by changing the for loop line to

For Temp = 3 to Num -1 Step 2

and adding a test line.

If Num = 2 then
lbOutput.Caption = Num & " Is Prime"
Exit Sub
Else
if Num mod 2 = 0 then
bOutput.Caption = Num & " Is Not Prime"
Exit Sub
End if, End if