43 47 53 59 61 67.
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It is: 1*71 = 71 because it is a prime number
71 73 79 83 89 97
71 is equal to a prime number because it has only two factors which are itself and one.
Well, well, well, aren't we getting into some prime number shenanigans? Let me break it down for you - 71 is a prime number, so the only way to get it is by multiplying 1 and 71. Ta-da! That's all she wrote, folks.
(59 + 71) / 2 = 65