Closest hex to #40c5b0 is #4ca

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#
#4ca

40c5b0

40c5b0

contains 4c

04c 14c 24c 34c 44c 4c0 4c1 4c2 4c3 4c4 4c5 4c6 4c7 4c8 4c9 4ca 4cb 4cc 4cd 4ce 4cf 54c 64c 74c 84c 94c a4c b4c c4c d4c e4c f4c

contains ca

0ca 1ca 2ca 3ca 4ca 5ca 6ca 7ca 8ca 9ca aca bca ca0 ca1 ca2 ca3 ca4 ca5 ca6 ca7 ca8 ca9 caa cab cac cad cae caf cca dca eca fca

contains 4a

04a 14a 24a 34a 44a 4a0 4a1 4a2 4a3 4a4 4a5 4a6 4a7 4a8 4a9 4aa 4ab 4ac 4ad 4ae 4af 54a 64a 74a 84a 94a a4a b4a c4a d4a e4a f4a