Hex #172a3e or rgb(23,42,62) in RGB space is the tint of blue. It has hue angle of 210.77 degrees, value = 24 and saturation = 63. #172a3e can be obtained by mixing 4 colors: 1 drop of red, 4 drops of blue, 1 drop of green, 5 drops of black.
Nearest safe hex - #003333. Below you can see the block with #172a3e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #172a3e to the mixer and play with it.