Closest hex to #643761 is #636

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#
#636

643761

643761

contains 63

063 163 263 363 463 563 630 631 632 633 634 635 636 637 638 639 63a 63b 63c 63d 63e 63f 663 763 863 963 a63 b63 c63 d63 e63 f63

contains 36

036 136 236 336 360 361 362 363 364 365 366 367 368 369 36a 36b 36c 36d 36e 36f 436 536 636 736 836 936 a36 b36 c36 d36 e36 f36

contains 66

066 166 266 366 466 566 660 661 662 663 664 665 666 667 668 669 66a 66b 66c 66d 66e 66f 766 866 966 a66 b66 c66 d66 e66 f66