42 + 26n, 42 + 26(n+1), 42 + 26(n+2), etc.
You add twenty-six each time, starting with forty-two.
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Un = 26x + 42
N+13
94 + 42 = 136
Add all the numbers; count how many there are, divide the sum by this count.
212.1111111 is the mean.