n = 100；

sum = 0；

Because i= 1: 1:n

sum=sum+ 1/i^2；

end

PI = sqrt(6 * sum)；

Proteasome inhibitor

PI =

3. 132 1

Answer: When n= 100, it is 3. 132 1.

clear

n = 1000；

sum = 0；

Because i= 1: 1:n

sum=sum+ 1/i^2；

end

PI = sqrt(6 * sum)；

Proteasome inhibitor

PI =

3. 1406

Answer: When n= 1000, it is 3. 1406.

clear

n = 10000；

sum = 0；

Because i= 1: 1:n

sum=sum+ 1/i^2；

end

PI = sqrt(6 * sum)；

Proteasome inhibitor

PI =

3. 14 15

Answer: When n= 10000, it is 3. 14 15.