A Blum integer is a semiprime—that is, the product of two distinct primes—whose factors have the form 
for some integer k. The number 21 is a Blum integer because its two prime factors, 3 and 7, have the form with 
and 
. The number 123 is a semiprime because it is 
, but it is not a Blum integer because 41 is not 3 more than a multiple of 4. The number 1463 is not a Blum integer: although its prime factors are distinct and each 3 more than a multiple of 4, there are three of them, not two.
for some integer k. The number 21 is a Blum integer because its two prime factors, 3 and 7, have the form with and . The number 123 is a semiprime because it is , but it is not a Blum integer because 41 is not 3 more than a multiple of 4. The number 1463 is not a Blum integer: although its prime factors are distinct and each 3 more than a multiple of 4, there are three of them, not two. Write a function to determine whether the numbers in a matrix are Blum integers.
Solution Stats
Solution Comments
Show comments
Loading...
Problem Recent Solvers8
Suggested Problems
-
First non-zero element in each column
942 Solvers
-
554 Solvers
-
Back to basics 23 - Triangular matrix
1117 Solvers
-
Moving average (variable kernel length)
135 Solvers
-
87 Solvers
More from this Author321
Problem Tags
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
