Closest hex to #561561 is #516

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#516

561561

561561

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 16

016 116 160 161 162 163 164 165 166 167 168 169 16a 16b 16c 16d 16e 16f 216 316 416 516 616 716 816 916 a16 b16 c16 d16 e16 f16

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