Closest hex to #315b15 is #351

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#
#351

315b15

315b15

contains 35

035 135 235 335 350 351 352 353 354 355 356 357 358 359 35a 35b 35c 35d 35e 35f 435 535 635 735 835 935 a35 b35 c35 d35 e35 f35

contains 51

051 151 251 351 451 510 511 512 513 514 515 516 517 518 519 51a 51b 51c 51d 51e 51f 551 651 751 851 951 a51 b51 c51 d51 e51 f51

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