Question 19
Anthony writes down in order all positive integers which are divisible by $2$. Bertha writes down in order all positive integers which are divisible by $3$. Claire writes down in order all positive integers which are divisible by $4$. Orderly Dora writes all numbers written by the other three. Thereby she puts them in order by size and does not repeat a number. What is the $2017$th number in her list?
(Richard Henner)
(Richard Henner)