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 .
Solve

Solution Stats

50.0% Correct | 50.0% Incorrect
Last Solution submitted on Jul 04, 2023

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers3

Suggested Problems

More from this Author116

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!