124, 421, and 224

Other numbers are also seen, of course. Many numbers.

But it is the ones you remember seeing that stick in your mind.

When a person sees a number with personal meaning, and if they notice that the number does indeed have personal meaning, then they're likely to remember seeing that number. Similarly, seeing numbers with emotional significance or with notable digit patterns are also more likely to be remembered.

It's highly likely those are the reasons you see those numbers.

The Why You Start Seeing Certain Numbers Again and Again article and also the article Why People See Certain Numbers All the Time provide additional information.

If you're interested in the meaning of the energy represented by those numbers, the meanings for both the number 124 and the number 421 include, among other things, introspection and scientific reasoning. The number 224, also among other things, business and material accumulation.