3rd Gen RSE Catch Rate

I saw a catch rate calculation so I tried it, but I don't think it's right. Either that or I'm not using it right. This is the calculation:

((4*TotalHP-2*CurrentHP)*(CatchRate*Ball))/TotalHP+Status=Result

There's a randomly chosen number between 0-255 and if this number is lower than the result, the Pokemon will be caught. In my case:

((4*37-2*3)*(45*1))/37+1=173.7

So 173.7 gives me a 68.12% success rate (according to my calculations). Yet I've thrown 40~ Pokeballs and failed to catch the Pokemon every single time. So is this calculation wrong or am I just really, really unlucky?

The formula you got (from Serebii, I guess?) is wrong, indeed. Check the related Bulbapedia article here for further info.

It will depend on the pokemon. Some had like a 3 catch rate. What Pokemon are you trying to get?

Well, if it doesn't work, you're either having hugely bad luck or it is wrong.
Do you have bad luck?

So it obviously is wrong. Read this article.

Oh, I was missing quite a lot. Thanks.

It was a Mawile btw.