This algorithm was created for studies and aims to find private keys of public wallets from the Bitcoin Challenge Transaction challenge.
Check for yourself on the website https://privatekeys.pw/puzzles/bitcoin-puzzle-tx
In 2015, in order to show the hugeness of the private key space (or maybe just for fun), someone created a "puzzle" where he chose keys in a certain smaller space and sent increasing amounts to each of those keys like this:
20 ≤ random key < 21 — 0.001 BTC 21 ≤ random key < 22 — 0.002 BTC 23 ≤ random key < 23 — 0.003 BTC ... 2255 ≤ random key < 2256 — 0.256 BTC (total 32.896 BTC)
First 65 and #70, #75, #80, #85, #90, #95, #100, #105, #110, #115, #120, #125 private keys have already been cracked.