Closest hex to #5b7580 is #578

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#
#578

5b7580

5b7580

contains 57

057 157 257 357 457 557 570 571 572 573 574 575 576 577 578 579 57a 57b 57c 57d 57e 57f 657 757 857 957 a57 b57 c57 d57 e57 f57

contains 78

078 178 278 378 478 578 678 778 780 781 782 783 784 785 786 787 788 789 78a 78b 78c 78d 78e 78f 878 978 a78 b78 c78 d78 e78 f78

contains 58

058 158 258 358 458 558 580 581 582 583 584 585 586 587 588 589 58a 58b 58c 58d 58e 58f 658 758 858 958 a58 b58 c58 d58 e58 f58