Closest hex to #185bbc is #15b

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#15b

185bbc

185bbc

contains 15

015 115 150 151 152 153 154 155 156 157 158 159 15a 15b 15c 15d 15e 15f 215 315 415 515 615 715 815 915 a15 b15 c15 d15 e15 f15

contains 5b

05b 15b 25b 35b 45b 55b 5b0 5b1 5b2 5b3 5b4 5b5 5b6 5b7 5b8 5b9 5ba 5bb 5bc 5bd 5be 5bf 65b 75b 85b 95b a5b b5b c5b d5b e5b f5b

contains 1b

01b 11b 1b0 1b1 1b2 1b3 1b4 1b5 1b6 1b7 1b8 1b9 1ba 1bb 1bc 1bd 1be 1bf 21b 31b 41b 51b 61b 71b 81b 91b a1b b1b c1b d1b e1b f1b