Closest hex to #137ef7 is #17f

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#17f

137ef7

137ef7

contains 17

017 117 170 171 172 173 174 175 176 177 178 179 17a 17b 17c 17d 17e 17f 217 317 417 517 617 717 817 917 a17 b17 c17 d17 e17 f17

contains 7f

07f 17f 27f 37f 47f 57f 67f 77f 7f0 7f1 7f2 7f3 7f4 7f5 7f6 7f7 7f8 7f9 7fa 7fb 7fc 7fd 7fe 7ff 87f 97f a7f b7f c7f d7f e7f f7f

contains 1f

01f 11f 1f0 1f1 1f2 1f3 1f4 1f5 1f6 1f7 1f8 1f9 1fa 1fb 1fc 1fd 1fe 1ff 21f 31f 41f 51f 61f 71f 81f 91f a1f b1f c1f d1f e1f f1f