Closest hex to #556688 is #568

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#
#568

556688

556688

contains 56

056 156 256 356 456 556 560 561 562 563 564 565 566 567 568 569 56a 56b 56c 56d 56e 56f 656 756 856 956 a56 b56 c56 d56 e56 f56

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 58

058 158 258 358 458 558 580 581 582 583 584 585 586 587 588 589 58a 58b 58c 58d 58e 58f 658 758 858 958 a58 b58 c58 d58 e58 f58