I was using Bitcoincrack to randomly Bruteforce addresses that share the same 7 letters of 16jY7qLJnxb7CHZyqBP8qca9d51gAjyXQN.
after bitcoincrack generated today 1000 addresses that share the same first 7 address characters ~ and indeed, i saw an addresses that ends with the last 3 characters "XQN" that the original puzzle 64 address have.
~
What are the odds that i find the last 3 characters address
Each character has 58 possibilities, so if you have 1000 addresses, the chance of finding the same 3 characters at the end is about 0.5%. However, you need to find 24 more characters, and those aren't magically going to match once you find the last 3.
But looks nice to have a vanity address with 10 characters and the same bit size.