Closest hex to #53c7fb is #5cf

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#
#5cf

53c7fb

53c7fb

contains 5c

05c 15c 25c 35c 45c 55c 5c0 5c1 5c2 5c3 5c4 5c5 5c6 5c7 5c8 5c9 5ca 5cb 5cc 5cd 5ce 5cf 65c 75c 85c 95c a5c b5c c5c d5c e5c f5c

contains cf

0cf 1cf 2cf 3cf 4cf 5cf 6cf 7cf 8cf 9cf acf bcf ccf cf0 cf1 cf2 cf3 cf4 cf5 cf6 cf7 cf8 cf9 cfa cfb cfc cfd cfe cff dcf ecf fcf

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