Closest hex to #521102 is #510

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#
#510

521102

521102

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 10

010 100 101 102 103 104 105 106 107 108 109 10a 10b 10c 10d 10e 10f 110 210 310 410 510 610 710 810 910 a10 b10 c10 d10 e10 f10

contains 50

050 150 250 350 450 500 501 502 503 504 505 506 507 508 509 50a 50b 50c 50d 50e 50f 550 650 750 850 950 a50 b50 c50 d50 e50 f50