A twin primes is a pair of prime numbers such that the diffe

A twin primes is a pair of prime numbers such that the difference between them is 2 (for example, 17 and 19). Write a computer program that finds all the twin primes between 10 and 500. The program displays the results in a two-column matrix in which each row is a twin prime. Do not use MATLAB\'s built-in function isprime. A list of 30 exam scores is: 31, 70, 92, 5, 47, 88, 81, 73, 51, 76, 80, 90, 55, 23, 43, 98, 36, 87, 22, 61, 19, 69, 26, 82, 89, 99, 71, 59, 49, 64 Write a computer program that determines how many grades are between 0 and 19, between 20 and 39, between 40 and 59, between 60 and 79, and between 80 and 100. The results are displayed in the following form: Grades between 0 and 19 2 students Grades between 20 and 39 4 students Grades between 40 and 59 6 students and so on.

Solution

14 ans:

%start the script

J=0; k=1;

For n=11:499

For i=2: n-1

If rem (n, i)   =0

J=j+1;

End

End

If==n-2

A (k) =n;

K=k+1;

End

J=0;

End

M=length (a);

Fprintf (‘the twin primes are:\ ’)

For p=1: m-1

If (a (p+1-a (p))==2

Fprintf (%i and %i\ ’, a (p), a (p+1))

End

End

The mat lab output

The twin primes are:

11 and 13

17 and 19

29 and 31

41 and 43

59 and 61

71 and 73

101 and 103

107 and 109

137 and 139

149 and 151

179 and 181

191 and 193

197 and 199

227 and 229

239 and 241

269 and 271

281 and 283

311 and 313

347 and 349

419 and 421

431 and 433

461 and 463