Solution
The sequence follows $$n^2+1$$ for n = 2,3,4,5,6,7:
$$2^2+1=5$$
$$3^2+1=10$$
$$4^2+1=17$$
$$5^2+1=26$$
$$6^2+1=37$$
$$7^2+1=50$$
Now, we can clearly notice that 38 is the incorrect term. It should be 37.
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