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1 solution
This is starting to get tough. Indeed, the clue # 666666 seems strange. But the problem title, and recalling that F stands for 6, means
# FFFFFF!
What's that? You certainly know that # FFFFFF is the code for white! Now suddenly B and R becomes clear. B = 255 and R = 255 for white. (do a google search if you're not sure). So, B R = 2 5 5 2 = 6 5 0 2 5 .