A sequence u1,u2,u3,… u_1, u_2, u_3, \dots\,u1,u2,u3,… is defined by
u1=3u_1 = 3u1=3, u2=5u_2 = 5u2=5
un=un−1+un−2u_n = u_{n-1} + u_{n-2}un=un−1+un−2, n≥3n \geq 3n≥3
Find u3u_3u3, u4 u_4\,u4 and u5u_5u5.