Closest hex to #3fe507 is #4d0

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#
#4d0

3fe507

3fe507

contains 4d

04d 14d 24d 34d 44d 4d0 4d1 4d2 4d3 4d4 4d5 4d6 4d7 4d8 4d9 4da 4db 4dc 4dd 4de 4df 54d 64d 74d 84d 94d a4d b4d c4d d4d e4d f4d

contains d0

0d0 1d0 2d0 3d0 4d0 5d0 6d0 7d0 8d0 9d0 ad0 bd0 cd0 d00 d01 d02 d03 d04 d05 d06 d07 d08 d09 d0a d0b d0c d0d d0e d0f dd0 ed0 fd0

contains 40

040 140 240 340 400 401 402 403 404 405 406 407 408 409 40a 40b 40c 40d 40e 40f 440 540 640 740 840 940 a40 b40 c40 d40 e40 f40