Closest hex to #540913 is #511

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#511

540913

540913

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 11

011 110 111 112 113 114 115 116 117 118 119 11a 11b 11c 11d 11e 11f 211 311 411 511 611 711 811 911 a11 b11 c11 d11 e11 f11

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