KöMaL 2023 K776
A printing press is preparing tickets to be sold for an event. When the tickets themselves have been printed out, they are fed in a machine that prints numbers on them, always incrementing the number by 1. Unfortunately, owing to a disorder of the numbering machine each number divisible by 3 was printed twice in a row. In this way, a total of 3672 digits were used. (The starting number was 1.) How many tickets need to be numbered again when the numbering machine is fixed and operating correctly?
Official text KöMaL. Quoted with source.
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