Closest hex to #1b3197 is #239

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#
#239

1b3197

1b3197

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

contains 39

039 139 239 339 390 391 392 393 394 395 396 397 398 399 39a 39b 39c 39d 39e 39f 439 539 639 739 839 939 a39 b39 c39 d39 e39 f39

contains 29

029 129 229 290 291 292 293 294 295 296 297 298 299 29a 29b 29c 29d 29e 29f 329 429 529 629 729 829 929 a29 b29 c29 d29 e29 f29