Closest hex to #2233ff is #23f

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#23f

2233ff

2233ff

contains 23

023 123 223 230 231 232 233 234 235 236 237 238 239 23a 23b 23c 23d 23e 23f 323 423 523 623 723 823 923 a23 b23 c23 d23 e23 f23

contains 3f

03f 13f 23f 33f 3f0 3f1 3f2 3f3 3f4 3f5 3f6 3f7 3f8 3f9 3fa 3fb 3fc 3fd 3fe 3ff 43f 53f 63f 73f 83f 93f a3f b3f c3f d3f e3f f3f

contains 2f

02f 12f 22f 2f0 2f1 2f2 2f3 2f4 2f5 2f6 2f7 2f8 2f9 2fa 2fb 2fc 2fd 2fe 2ff 32f 42f 52f 62f 72f 82f 92f a2f b2f c2f d2f e2f f2f