Closest hex to #55ff00 is #5f0

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#
#5f0

55ff00

55ff00

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

contains f0

0f0 1f0 2f0 3f0 4f0 5f0 6f0 7f0 8f0 9f0 af0 bf0 cf0 df0 ef0 f00 f01 f02 f03 f04 f05 f06 f07 f08 f09 f0a f0b f0c f0d f0e f0f ff0

contains 50

050 150 250 350 450 500 501 502 503 504 505 506 507 508 509 50a 50b 50c 50d 50e 50f 550 650 750 850 950 a50 b50 c50 d50 e50 f50