[naiquevin]

Whoa! I think I may be having a weaker version of the same type of synesthesia that you have described. I tend to "imagine" colours when I think of certain letters, numbers, days or months. I don't feel this way for each one of them though.. for eg. 2 = red, 4 = green, 5 = pink, 6 = blue, 7 = purple whereas nothing for 0, 1, 3, 8 and 9 (may be black?). Similarly, E = yellow, F = pink, saturday = green, march = yellow etc. Also, I don't "see" colours while reading text, just when I happen to think more about a letter, number or word.

All this while I was thinking this is common and normal in all people like photographic memory or something. Learnt something new today :-)

[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!

[danabramov]

Yup, I have this as well. 1 is black, 2 is yellow, 3 is green, 4 is orange, and so on. It has a side-effect: it's easier to remember phone numbers because I visualize sequences of colors (239 is yellow-green-brown, etc).

[namelesstrash01]

I can understand something like a phone number, where each digit is singular and stands apart from the others. If you're saying that about composite numbers (like 'two hundred and thirty nine'), you're the first person I've met claiming that word/number-color synesthesia helps them remember composites/sums.