Question

Write three numbers which have only 3 factors.​

Answer 1

so, the square of all prime numbers which is between 10 and 31 is the 3-digit number which has only 3 factors. Now, primes between 10 and 31 are 11,13,17,19,23,29 and 31. square of these primes are respectively 121,169,289,361,529,841 and 961 which are the required numbers.

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