Closest hex to #991991 is #919

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#919

991991

991991

contains 91

091 191 291 391 491 591 691 791 891 910 911 912 913 914 915 916 917 918 919 91a 91b 91c 91d 91e 91f 991 a91 b91 c91 d91 e91 f91

contains 19

019 119 190 191 192 193 194 195 196 197 198 199 19a 19b 19c 19d 19e 19f 219 319 419 519 619 719 819 919 a19 b19 c19 d19 e19 f19

contains 99

099 199 299 399 499 599 699 799 899 990 991 992 993 994 995 996 997 998 999 99a 99b 99c 99d 99e 99f a99 b99 c99 d99 e99 f99