Problem 60971. List the twin prime couples

Problem statement
The twin prime couples (p,p') are the ones such that p' = p + 2.
For a given integer n > 1, list the twin prime couples less or equal to n.
Present your result in a m x 2 matrix, where m is the number of twin couples.
Examples
  • n = 10 => p = [3, 5; 5, 7];
  • n = 20 => p = [3, 5; 5, 7; 11, 13; 17 19];
  • n = 100 => p = [3, 5; 5, 7; 11, 13; 17 19; 29, 31; 41, 43; 59, 61; 71, 73];
Forbidden functions / expressions
  • regexp
  • assignin
  • str2num
  • echo
See also
Solve

Solution Stats

76.19% Correct | 23.81% Incorrect
Last Solution submitted on Sep 21, 2025

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