What's the 36th number in math problem 5 7 9 11 down 3 8 15 24 35 up 3 8 15 24 35 ————————Find out the law of up and down, and calculate the number of the 36th digit with the fastest speed! 5 7 9 11

What's the 36th number in math problem 5 7 9 11 down 3 8 15 24 35 up 3 8 15 24 35 ————————Find out the law of up and down, and calculate the number of the 36th digit with the fastest speed! 5 7 9 11

Uplink: y = x * x + 2x
Downward: y = 2x + 3
Carry in: uplink y = 36 * 36 + 2 * 36 = 1368
Downward y = 2 * 36 + 3 = 75