[namelesstrash01]

Yes, that's exactly it! Some letters are not there (actually most letters), and I know that some numbers are "weaker" than others. I also know that some of these color synesthetics have changed over time. For example, I know that the number 2 for me didn't always trigger darkish pink, but I can't remember what it used to be. Also, I have lost synesthesia for G, H, and J, which used to be yellowish, yellowish, and green, but now don't "do" anything.

If you are experiencing more of a one-to-one idea/color analogue instead of a simple kind of "association" between an idea and a color, then what you are describing is highly likely to be similar to what I have, which is word-color synesthesia, the most common form of the "condition". For example, it's much more intrinsic than the simple association we normally feel between, say, the word "money" and the color green. That's a simple word-color association. When I see the word "March", I "feel/see/experience" the color blue (and vice versa, though this vice versa is a bit weird because I'm not so good at distinguishing individual colors).

[naiquevin]

Yes, it's different from the money-green association. I wonder what made me think it was normal and everyone else thought this way too!