It is: 237 = 70
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30, 42, and 70
It is: 2*5*7 = 70 and no indices are needed
70
2 x 5 x 7 = 70
2 x 37 = 74 As the product is an even number one of the prime numbers must be 2. Then just check all the even numbers between 70 and 80 that is double a prime number: 74 = 2 x 37.