Closest hex to #21806a is #286

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#
#286

21806a

21806a

contains 28

028 128 228 280 281 282 283 284 285 286 287 288 289 28a 28b 28c 28d 28e 28f 328 428 528 628 728 828 928 a28 b28 c28 d28 e28 f28

contains 86

086 186 286 386 486 586 686 786 860 861 862 863 864 865 866 867 868 869 86a 86b 86c 86d 86e 86f 886 986 a86 b86 c86 d86 e86 f86

contains 26

026 126 226 260 261 262 263 264 265 266 267 268 269 26a 26b 26c 26d 26e 26f 326 426 526 626 726 826 926 a26 b26 c26 d26 e26 f26