5. Write 7 consecutive natural numbers such that among the digits in their notation there are exactly 16 twos. (Consecutive numbers differ by 1.)
Answer. Any of the following two sequences will do:

2229, 2230, 2231, 2232, 2233, 2234, 2235

2215, 2216, 2217, 2218, 2219, 2220, 2221