I found almost 18 prefix (13zb1hQ) with 0x28 private key. I always knew the taget very likely to be there, starts wit 28, even tried to spend days bruteforcing 0x28 range but was not successful to find the key. It was just gut feeling but I'm sure no math trick/prime number pattern/algorithm is applied to puzzles without public key otherwise sha256/hash160 and secp256k1 are broken.