Closest hex to #5511ff is #51f

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#
#51f

5511ff

5511ff

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 1f

01f 11f 1f0 1f1 1f2 1f3 1f4 1f5 1f6 1f7 1f8 1f9 1fa 1fb 1fc 1fd 1fe 1ff 21f 31f 41f 51f 61f 71f 81f 91f a1f b1f c1f d1f e1f f1f

contains 5f

05f 15f 25f 35f 45f 55f 5f0 5f1 5f2 5f3 5f4 5f5 5f6 5f7 5f8 5f9 5fa 5fb 5fc 5fd 5fe 5ff 65f 75f 85f 95f a5f b5f c5f d5f e5f f5f