t(3) = 10 - 32 = 1
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1 4 9 is a series of squared numbers. The nth term is [ n squared ]
t(n) = t(n - 1) + (10n - 9)
f = 10n + (n - 1)^2 For n=10 f = 10(10) + (10 - 1)^2 f = 181
It is not possible to determine an nth term from a single number.
Nth term With the nth term you substitute the n for the term number (e.g. 50) so the 50th term in 2n+3 would be 2x50+3=103