There are 216 web safe colors. These are safe to use on any web page as these colors are supported by almost all hardwares and operating systems. These colors when broken into RGB(Red Green Blue) values, each value would be divisible by 51. e.g. #6666CC would give Red = 6*16+6 = 102 = 51*2, Green = 6*16+6 = 102 = 51*2 and Blue = 12*16+12 = 204 = 51*4. In other terms, web safe colors are permutations of (00,33,66,99,CC,FF) values of each R, G and B; which constitutes to 6*6*6 = 216 colors.
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