Work Step by Step
According to the exercise: $a_1=2$ $a_2=(a_1)^2+1=2^2+1=5$ $a_3=(a_2)^2+1=5^2+1=26$ $a_4=(a_3)^2+1=26^2+1=677$ $a_5=(a_4)^2+1=677^2+1=458330$
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