A pattern

If I have a pattern that starts with 1, 4, 9, 16, 25... and so on, which of the following numbers would not appear?

Correct answer:

a6 =  36
a7 =  49
a8 =  64

Step-by-step explanation:

a1=12=1 a2=22=4 a3=32=9 a4=42=16 a5=52=25 a6=62=36
a7=72=49
a8=82=64



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