Closest hex to #540d1b is #512

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#
#512

540d1b

540d1b

contains 51

051 151 251 351 451 510 511 512 513 514 515 516 517 518 519 51a 51b 51c 51d 51e 51f 551 651 751 851 951 a51 b51 c51 d51 e51 f51

contains 12

012 112 120 121 122 123 124 125 126 127 128 129 12a 12b 12c 12d 12e 12f 212 312 412 512 612 712 812 912 a12 b12 c12 d12 e12 f12

contains 52

052 152 252 352 452 520 521 522 523 524 525 526 527 528 529 52a 52b 52c 52d 52e 52f 552 652 752 852 952 a52 b52 c52 d52 e52 f52