Closest hex to #66aa88 is #6a8

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#
#6a8

66aa88

66aa88

contains 6a

06a 16a 26a 36a 46a 56a 66a 6a0 6a1 6a2 6a3 6a4 6a5 6a6 6a7 6a8 6a9 6aa 6ab 6ac 6ad 6ae 6af 76a 86a 96a a6a b6a c6a d6a e6a f6a

contains a8

0a8 1a8 2a8 3a8 4a8 5a8 6a8 7a8 8a8 9a8 a80 a81 a82 a83 a84 a85 a86 a87 a88 a89 a8a a8b a8c a8d a8e a8f aa8 ba8 ca8 da8 ea8 fa8

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