Closest hex to #81f81f is #8f2

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#8f2

81f81f

81f81f

contains 8f

08f 18f 28f 38f 48f 58f 68f 78f 88f 8f0 8f1 8f2 8f3 8f4 8f5 8f6 8f7 8f8 8f9 8fa 8fb 8fc 8fd 8fe 8ff 98f a8f b8f c8f d8f e8f f8f

contains f2

0f2 1f2 2f2 3f2 4f2 5f2 6f2 7f2 8f2 9f2 af2 bf2 cf2 df2 ef2 f20 f21 f22 f23 f24 f25 f26 f27 f28 f29 f2a f2b f2c f2d f2e f2f ff2

contains 82

082 182 282 382 482 582 682 782 820 821 822 823 824 825 826 827 828 829 82a 82b 82c 82d 82e 82f 882 982 a82 b82 c82 d82 e82 f82