Answer
$a_1=15$
$a_2=19$
$a_3=23$
$a_4=27$
$a_5=31$
Work Step by Step
$a_1=15,~~a_{n+1}=a_n+4$
$a_2=a_1+4=15+4=19$
$a_3=a_2+4=19+4=23$
$a_4=a_3+4=23+4=27$
$a_5=a_4+4=27+4=31$
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