Closest hex to #18cb31 is #1c3

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#
#1c3

18cb31

18cb31

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 c3

0c3 1c3 2c3 3c3 4c3 5c3 6c3 7c3 8c3 9c3 ac3 bc3 c30 c31 c32 c33 c34 c35 c36 c37 c38 c39 c3a c3b c3c c3d c3e c3f cc3 dc3 ec3 fc3

contains 13

013 113 130 131 132 133 134 135 136 137 138 139 13a 13b 13c 13d 13e 13f 213 313 413 513 613 713 813 913 a13 b13 c13 d13 e13 f13