lets see who gives solution part-2

The series is actually $n^{2} + n \quad such \quad that \quad n=k^{2} \quad where \quad k \in N$

Write a solution. 1^2+1,4^2+4,9^2+9,16^2+16 so 25^2+25= 650

The pattern of the series is (n^4+n^2)