Among the many pure numbers beneath 100, there are 30 with a particular property. Jovan has listed them within the desk right here.
However Jovan made a mistake, and considered one of these numbers have to be changed. Which quantity have to be inserted instead of the wrong quantity?
The quantity 75 have to be changed by the quantity 74. The numbers within the desk are every the product of two prime numbers, ordered by dimension. The 75 doesn’t match with the opposite numbers as a result of it’s the product of three prime numbers.
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This puzzle initially appeared in Spektrum der Wissenschaft and was reproduced with permission.
