Closest hex to #550000 is #500

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#
#500

550000

550000

contains 50

050 150 250 350 450 500 501 502 503 504 505 506 507 508 509 50a 50b 50c 50d 50e 50f 550 650 750 850 950 a50 b50 c50 d50 e50 f50

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

contains 50

050 150 250 350 450 500 501 502 503 504 505 506 507 508 509 50a 50b 50c 50d 50e 50f 550 650 750 850 950 a50 b50 c50 d50 e50 f50