My guess is 67.
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Originally Posted by Username This exact question was in the Australian Maths Competition, the answer is 14. yup, that's where i got it from. That was the only question out of the last 5 that I got so I was wondering if it was correct. I guess I am right then!! Yay!!
Originally Posted by jgv115 How many numbers under 2010 have only 3 factors? I got this question recently, I completed it but I do not know if it is correct. Could someone work it out? Thanks! "Only" three factors ought to qualify the search to 1, itself and it's square root (which must be prime).
Originally Posted by Archie Meade "Only" three factors ought to qualify the search to 1, itself and it's square root (which must be prime). This was mentioned by the OP in post #3.
Originally Posted by undefined This was mentioned by the OP in post #3. Then I agree completely with that 3rd post, with emphasis on the word "only" in the question.
Sorry for the ambiguity of the question guys, I don't have the question booklet so I can't remember the exact question...