Closest hex to #30b631 is #3b3

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#3b3

30b631

30b631

contains 3b

03b 13b 23b 33b 3b0 3b1 3b2 3b3 3b4 3b5 3b6 3b7 3b8 3b9 3ba 3bb 3bc 3bd 3be 3bf 43b 53b 63b 73b 83b 93b a3b b3b c3b d3b e3b f3b

contains b3

0b3 1b3 2b3 3b3 4b3 5b3 6b3 7b3 8b3 9b3 ab3 b30 b31 b32 b33 b34 b35 b36 b37 b38 b39 b3a b3b b3c b3d b3e b3f bb3 cb3 db3 eb3 fb3

contains 33

033 133 233 330 331 332 333 334 335 336 337 338 339 33a 33b 33c 33d 33e 33f 433 533 633 733 833 933 a33 b33 c33 d33 e33 f33