Closest hex to #1b4037 is #243

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#
#243

1b4037

1b4037

contains 24

024 124 224 240 241 242 243 244 245 246 247 248 249 24a 24b 24c 24d 24e 24f 324 424 524 624 724 824 924 a24 b24 c24 d24 e24 f24

contains 43

043 143 243 343 430 431 432 433 434 435 436 437 438 439 43a 43b 43c 43d 43e 43f 443 543 643 743 843 943 a43 b43 c43 d43 e43 f43

contains 23

023 123 223 230 231 232 233 234 235 236 237 238 239 23a 23b 23c 23d 23e 23f 323 423 523 623 723 823 923 a23 b23 c23 d23 e23 f23