6 color
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Credit to Numberblocks for the images.
14 16 17 20 21 27 31 60 3 6 11 22 49 55 70 2 10 12 15 19 26 29 90 4 18 25 28 36 40 80 81 5 8 9 13 35 50 60 1 7 23 24 30 32 45 100
Credit to Numberblocks for the images.