For n = 1, 2, 3, 4, 5, ...
the sequence goes 4, 5, 6, 7, 8, ...
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Put N = 10 and what you get is U10 = 5*10 + 3 = 50 + 3 = 53.
Put n = 1, 2, 3, 4 etc in the expression 5n + 2 and evaluate to get the sequence.
Strangely enough, it is 9n + 1 for n = 1, 2, 3, ...
A(1) = 12A(4) = 3 A(10) = -15.
5+n+3 = 8+n