Closest hex to #b30b30 is #b13

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#b13

b30b30

b30b30

contains b1

0b1 1b1 2b1 3b1 4b1 5b1 6b1 7b1 8b1 9b1 ab1 b10 b11 b12 b13 b14 b15 b16 b17 b18 b19 b1a b1b b1c b1d b1e b1f bb1 cb1 db1 eb1 fb1

contains 13

013 113 130 131 132 133 134 135 136 137 138 139 13a 13b 13c 13d 13e 13f 213 313 413 513 613 713 813 913 a13 b13 c13 d13 e13 f13

contains b3

0b3 1b3 2b3 3b3 4b3 5b3 6b3 7b3 8b3 9b3 ab3 b30 b31 b32 b33 b34 b35 b36 b37 b38 b39 b3a b3b b3c b3d b3e b3f bb3 cb3 db3 eb3 fb3