Closest hex to #13d180 is #1c8

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#
#1c8

13d180

13d180

contains 1c

01c 11c 1c0 1c1 1c2 1c3 1c4 1c5 1c6 1c7 1c8 1c9 1ca 1cb 1cc 1cd 1ce 1cf 21c 31c 41c 51c 61c 71c 81c 91c a1c b1c c1c d1c e1c f1c

contains c8

0c8 1c8 2c8 3c8 4c8 5c8 6c8 7c8 8c8 9c8 ac8 bc8 c80 c81 c82 c83 c84 c85 c86 c87 c88 c89 c8a c8b c8c c8d c8e c8f cc8 dc8 ec8 fc8

contains 18

018 118 180 181 182 183 184 185 186 187 188 189 18a 18b 18c 18d 18e 18f 218 318 418 518 618 718 818 918 a18 b18 c18 d18 e18 f18