Question

21. An isolated prime is a prime number p such that neither p -2 nor p+2 is prime. For example, 47 is an isolated prime since 45 and 49 are both not primes. Write a computer program that finds all the isolated primes between 50 and 100. Do not use MATLAB's built-in function isprime. Matlab Instructions: Make in while and for, mode

Answer 1

Matlab Code

clear;clc;
i = 0;
for a=50:100
if rem(a,2:a/2)~=0
i = i+1;
p(i) = a;   
end
end

for i = 1:length(p)
if ismember((p(i)-2),p) && ismember((p(i)+ 2),p)
p = p(p~=p(i));
end
end

p
  

clear: clc 1 for a-50:100 if rem (a, 2:a/2)0 5 p(i)a 6 end end for i = 1: length (p) 10 if ismember ( (p (i)-2),p) ismember ( (p (i)+ 2),p) && 12 - 13- Command Window p = p(p~=p ( 1 ) ) ; end 71 97 53 59 61 67 73 79 83 89