Problem 53740. Easy Sequences 59: Almost Twin Primes
A positive integer pair , is called an "almost twin prime pair", if one of the pair is a prime and the other is either a prime or a semiprime. A semiprime is a natural number that is a product of only two and exactly two (not necessarily distinct) prime numbers (e.g. 4, 6, 9, , , , , , ...).
Listed below are all almost twin prime pairs with no element greater than :
Our task in this exercise is, to create a function that counts the number of almost twin prime pairs whose elements are less than or equal to a given limit Therefore for , our function should return .
Solution Stats
Problem Comments
Solution Comments
Show commentsProblem Recent Solvers3
Suggested Problems
-
Return the largest number that is adjacent to a zero
5206 Solvers
-
2383 Solvers
-
Right Triangle Side Lengths (Inspired by Project Euler Problem 39)
1607 Solvers
-
Check that number is whole number
3965 Solvers
-
266 Solvers
More from this Author116
Problem Tags
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!