```x = 1y = 1prev_answer = 1answer = None
while x <= 525:    answer = x*y + prev_answer + 3    print(f"{x = } ==> {answer = }")    x += 1    y += 1    prev_answer = answer```
https://md.darknebu.la/4cDzvoArTDCD-hpjSmVTwQ?view#Fast-Enough