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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

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