Closest hex to #1a51a5 is #25a

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#25a

1a51a5

1a51a5

contains 25

025 125 225 250 251 252 253 254 255 256 257 258 259 25a 25b 25c 25d 25e 25f 325 425 525 625 725 825 925 a25 b25 c25 d25 e25 f25

contains 5a

05a 15a 25a 35a 45a 55a 5a0 5a1 5a2 5a3 5a4 5a5 5a6 5a7 5a8 5a9 5aa 5ab 5ac 5ad 5ae 5af 65a 75a 85a 95a a5a b5a c5a d5a e5a f5a

contains 2a

02a 12a 22a 2a0 2a1 2a2 2a3 2a4 2a5 2a6 2a7 2a8 2a9 2aa 2ab 2ac 2ad 2ae 2af 32a 42a 52a 62a 72a 82a 92a a2a b2a c2a d2a e2a f2a