Twin primes, or prime numbers that differ by 2 (e.g., 17 and 19, 59 and 61, or 191 and 193), are the subject of several Cody problems: 248, 1096, 3016, and 52298. (See also Cody Problem 53740 for “almost twin primes”.)
This problem deals with twin composites. Because all even numbers are twin composites, let’s focus on odd twin composites, such as 25 and 27, 63 and 65, and 169 and 171.
Write a function that takes a number and produces a two-column matrix with the smaller number of the odd twin composite pair in the first column and the larger in the second column.
Optional exercises: (a) prove that the number of odd twin composites is infinite, (b) prove that the number of twin primes is infinite.
Solution Stats
Problem Comments
Solution Comments
Show comments
Loading...
Problem Recent Solvers9
Suggested Problems
-
506 Solvers
-
First non-zero element in each column
955 Solvers
-
Sum of diagonal of a square matrix
1640 Solvers
-
Longest run of consecutive numbers
6601 Solvers
-
440 Solvers
More from this Author323
Problem Tags
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
