Proctor's prisoner number is 22489. This is perhaps a homage to the most famous prisoner number is theater/movie history, 24601, Jean Valjean's prisoner number from Les Miserables. Notice how prominently the number is stenciled on Proctor's shirt. Considering a repeating continuum of digits from 0-9 (I.e. 012345678901234567890) adding the first digit of Proctor's number, 2, to each of the successive digits, 2489, then starting with the 2 and the resultant numbers, 22489 becomes 24601.