Answer
$\left\{
-2,-1,0,1,2
\right\}
$
Work Step by Step
Given that $
a_n=n-3
$, then the first 5 terms are
\begin{array}{l}
a_1=1-3\\
a_1=-2
,\\\\
a_2=2-3\\
a_2=-1
,\\\\
a_3=3-3\\
a_3=0
,\\\\
a_4=4-3\\
a_4=1
,\\\\
a_5=5-3\\
a_5=2
.\end{array}
Hence, the first 5 terms are $
\left\{
-2,-1,0,1,2
\right\}
$.