Closest hex to #19FF00 is #1f0

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#
#1f0

19FF00

19FF00

contains 1f

01f 11f 1f0 1f1 1f2 1f3 1f4 1f5 1f6 1f7 1f8 1f9 1fa 1fb 1fc 1fd 1fe 1ff 21f 31f 41f 51f 61f 71f 81f 91f a1f b1f c1f d1f e1f f1f

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 10

010 100 101 102 103 104 105 106 107 108 109 10a 10b 10c 10d 10e 10f 110 210 310 410 510 610 710 810 910 a10 b10 c10 d10 e10 f10