Closest hex to #55aaff is #5af

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#5af

55aaff

55aaff

contains 5a

05a 15a 25a 35a 45a 55a 5a0 5a1 5a2 5a3 5a4 5a5 5a6 5a7 5a8 5a9 5aa 5ab 5ac 5ad 5ae 5af 65a 75a 85a 95a a5a b5a c5a d5a e5a f5a

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 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