Closest hex to #003F00 is #040

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#
#040

003F00

003F00

contains 04

004 040 041 042 043 044 045 046 047 048 049 04a 04b 04c 04d 04e 04f 104 204 304 404 504 604 704 804 904 a04 b04 c04 d04 e04 f04

contains 40

040 140 240 340 400 401 402 403 404 405 406 407 408 409 40a 40b 40c 40d 40e 40f 440 540 640 740 840 940 a40 b40 c40 d40 e40 f40

contains 00

000 001 002 003 004 005 006 007 008 009 00a 00b 00c 00d 00e 00f 100 200 300 400 500 600 700 800 900 a00 b00 c00 d00 e00 f00