For those who don't understand prefixes, if you want to try your luck, this is the best current option for puzzle 71. If you're not interested in searching the entire range, where random + sequential and prefixes are equal in terms of statistical significance, you're just trying your luck, which means you don't need to scan the entire range. You get better results by using prefixes, which have huge advantages.

https://bitcointalk.org/index.php?topic=5546684