51,52,54,55,56,57,58,60,62,63,64,65,66,68,69 are the composite numbers between 50 and 70.
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All of them except for 53, 59, 61 and 67 which are prime numbers because they have only two factors.
All of them except for 53, 59, 61 and 67 which are prime numbers
70 and 90
51
452
All of them except for 61 and 67 which are prime numbers