Closest hex to #3f000f is #401

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#
#401

3f000f

3f000f

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 01

001 010 011 012 013 014 015 016 017 018 019 01a 01b 01c 01d 01e 01f 101 201 301 401 501 601 701 801 901 a01 b01 c01 d01 e01 f01

contains 41

041 141 241 341 410 411 412 413 414 415 416 417 418 419 41a 41b 41c 41d 41e 41f 441 541 641 741 841 941 a41 b41 c41 d41 e41 f41