Closest hex to #aa11ff is #a1f

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#
#a1f

aa11ff

aa11ff

contains a1

0a1 1a1 2a1 3a1 4a1 5a1 6a1 7a1 8a1 9a1 a10 a11 a12 a13 a14 a15 a16 a17 a18 a19 a1a a1b a1c a1d a1e a1f aa1 ba1 ca1 da1 ea1 fa1

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 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