find the first 4 terms of the sequence

Question

Find the first four terms of the sequence given by the following.

an=54+3(n-1),n=1,2,3...

Answer 1

a_n = 54 + 3(n - 1)

a₁ = 54 + 3(1 - 1)

a₂ = 54 + 3(2 - 1)

a₃ = 54 = 3(3 - 1)

a₄ = ?