65 37 17 what's the next number

65 37 17 what's the next number

8*8+1=64
6*6+1=37
4*4+1=17
2*2+1=5

Fill in the blanks 65 37 17 ()
Why add 5

The square of 8 plus 1 64
The square of 6 plus 1 37
Square of 4 plus 1 17
The square of two plus one and five
Expert answers quality assurance

2,5,10,17,26,37,50,65. How many numbers is 2501 in the above column

The sequence is equivalent to a (n) = n * n + 1, n = 1,2,3,4 1——2=1*1+1 2——5=2*2+1 3——10=3*3+1 4——17=4*4+1 …… …… 50-2501 = 50 * 50 + 1, so it's the 50th

What are the rules of 2, - 5,10, - 17,26, - 37 (), - 65?

The first is a positive number and a negative number interval. If you don't look at the sign, the difference is
5-2=3
10-5=5
17-10=7
26=17=9
37-26=11
50-37=13
65-50=15
……
So it's 50