Closest hex to #a13a13 is #931

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#
#931

a13a13

a13a13

contains 93

093 193 293 393 493 593 693 793 893 930 931 932 933 934 935 936 937 938 939 93a 93b 93c 93d 93e 93f 993 a93 b93 c93 d93 e93 f93

contains 31

031 131 231 310 311 312 313 314 315 316 317 318 319 31a 31b 31c 31d 31e 31f 331 431 531 631 731 831 931 a31 b31 c31 d31 e31 f31

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