ERJ Brainteaser – September

The ERJ Brainteaser for September has been solved by several readers. The problem was to find the codes for two combination locks, each with a five-digit code, where each digit was a prime number and each successive pair of digits formed a two-digit number that was not a prime number. The solutions provided by the readers are as follows: 32257 and 35772. The readers who solved the problem correctly are Amparo Botella, Bharat B Sharma, Hans-Bernd Luechtefeld, Kamila Staszewska, John Bowen, and Kate Burns. Andrew Knox provided an alternative solution, assuming that the combination locks had four rollers instead of five, and his solution was 3257 and 3572.