Then we should also add the following
+S(R1 ∩ R2 ∩ R3) = 100

😃

При подсчёте пользователей нужно пропускать все числа с цифрами 4 или 9.
Если слегка переформулировать - нужно определить, какое число будет стоять на n-м месте в ряду натуральных чисел после исключения из этого ряда всех чисел, содержащих 4 и 9.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
1 2 3 5 6 7 8 10 11 12 13 15 16 17 18 20 21 22 23 25 26 27 28 30 31
На 4-м месте стоит 5, на 16-м стоит 20, на 24-м - 30, и т.д.

if digits(n) == digits(n*n):
        return None

What about 4762? ;)

It is not explicitly stated, but you should consider the following restrictions.
The name of the city must come first in the line. The name of the team must be one word consisting of at least two letters, the first of which is capitalized, the rest - lowercase. Any symbols other than letters of the alphabet are not allowed in the name.

You probably get an error already when the base is 2. This is because with a base of 2, only "digits" less than 2 can be used in writing a number. Just like for any other bases.
And the entry for "12" uses "2".

Согласен

you need to do the same calculations with n as in the programming language ;-)

Compare words (groups of words) separated by a comma. Also, when comparing, you must take the case of letters into account, even though the description says otherwise. The lexicographic sorting is also unnecessary if the letters match.

There is an error in the description. It says that letters should be compared case insensitive, but the tests can only succeed if they are case-sensitive. The lexicographic sorting is also unnecessary if the letters match.

Daily. Every day you get p/360 percent to the amount in your account.
Yes, in a calendar year of 365 days you will accumulate more than p.