Question

what is the next term

2 , 5 , 10 , 17 , ..

Answer 1

2 = 1^2+1
5=2^2+1
10=3^2+1
17=4^2+1 so

26 = 5^2+1

Answer 2

2,5,10,17,26,37.....
increases by odd numbers
adding 3,5,7,9,11,13