Closest hex to #404404 is #440

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#
#440

404404

404404

contains 44

044 144 244 344 440 441 442 443 444 445 446 447 448 449 44a 44b 44c 44d 44e 44f 544 644 744 844 944 a44 b44 c44 d44 e44 f44

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 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