Question

find first five term of the sequence, defined by a1=1 and an =an-1+3

Answer 1

a1 = 1

a2 = a1 + 3 =  1 + 3 = 4

a3 = a2 + 3 = 4 + 3 = 7

a4 = a3 + 3 = 7 + 3 = 10

a5 = a4 + 3 = 10 + 3 = 13

Five terms

1, 4, 7, 10, 13