Closest hex to #11aaff is #1af

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#
#1af

11aaff

11aaff

contains 1a

01a 11a 1a0 1a1 1a2 1a3 1a4 1a5 1a6 1a7 1a8 1a9 1aa 1ab 1ac 1ad 1ae 1af 21a 31a 41a 51a 61a 71a 81a 91a a1a b1a c1a d1a e1a f1a

contains af

0af 1af 2af 3af 4af 5af 6af 7af 8af 9af aaf af0 af1 af2 af3 af4 af5 af6 af7 af8 af9 afa afb afc afd afe aff baf caf daf eaf faf

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