Since 12 March, so for two and a half weeks now as we write on 30 March, the number of Covid-19 cases and deaths has been increasing exponentially both worldwide and in the UK.
Worldwide the numbers of cases and deaths are both doubling about every week. In the UK, the number of cases is doubling about every three and a half days, the number of deaths about every three days.
The neatness of the pattern is probably coincidental. Country case-counts vary widely with the width of testing, and if the figures were accurate the death graph would lag behind the cases graph rather than tracking it.