Closest hex to #638616 is #681

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#
#681

638616

638616

contains 68

068 168 268 368 468 568 668 680 681 682 683 684 685 686 687 688 689 68a 68b 68c 68d 68e 68f 768 868 968 a68 b68 c68 d68 e68 f68

contains 81

081 181 281 381 481 581 681 781 810 811 812 813 814 815 816 817 818 819 81a 81b 81c 81d 81e 81f 881 981 a81 b81 c81 d81 e81 f81

contains 61

061 161 261 361 461 561 610 611 612 613 614 615 616 617 618 619 61a 61b 61c 61d 61e 61f 661 761 861 961 a61 b61 c61 d61 e61 f61