What is the next number of the following sequence - 13, 34, 74, 170, 290, ??

Answer 1

13 = 4 + 9 = 2^2 + 3^2
34 = 9+25 = 3^2 + 5^2
74 = 25 + 49 = 5^2 + 7^2
170 = 49 + 121 = 7^2 + 11^2
290 = 121 + 169 = 11^2 + 13^2

Similarly

458 = 169+289 = 13^2 + 17^2