drwww, the answers others have given are correct for Paratext 8.0 and earlier. (I also appreciated the formula.) However, before you spend too much time on this, you might want to be aware that Paratext 8.1 introduces two additional options which I hope are both better than using the old OLE numbers.
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Use one of the color aliases which ships with Paratext, such as “$blue_text”. This is recommended because different themes can then supply the shade of blue which works best within that theme. Currently, the only themes are for Light and Bright highlighting, but in the future we’d like to provide high-contrast and colorblind-friendly themes. High-contrast would use light text on a dark background.
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Use a standard RGB hexcode, prefixed by an “x”. For example, x005404 represents a dark green. This is the option anon848905 mentioned. (BTW, I like using colorizer.org to fiddle with colors.)
Paratext 8.1 Help covers the new codes via this help topic: “How do I implement a custom stylesheet for my project?”