Chapter 11 - Sections 11.1-11.3 - Integrated Review - Sequences and Series - Page 653: 1

$\left\{ -2,-1,0,1,2 \right\} $

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\} $.