Quote Originally Posted by Innila View Post
Hi,

What is the next number in this series
5, 25, 61, 113, 181, ???, .....
(This could be simple for so many of u )
What is the next number in this series
5, 25, 61, 113, 181, ???, .

The ans is 265.

Solutions: 1^2+2^2 = 1 +4 = 5
3^2+4^2 = 9+16 = 25
5^2+6^2 = 25+36 = 61
7^2+8^2 = 49+64 = 113
9^2+10^2 = 81+100 = 181

Now
11^2 + 12^2 = 121+144 = 265