# Questions tagged [semiprimes]

A semiprime is a natural number that is the product of two prime numbers. This tag is intended for questions about, related to, or involving semiprime numbers.

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### Is there a way to prove than a group of numbers created by an equation contains a semiprime? [closed]

Let's say the group generated by $n^{2}$ when n,n+1,n+2......2n
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### How can prime numbers be identified through characteristics of matrix/grid structures formed by polyhedra?

Have you come across a similar theory to predict prime numbers? I believe that I have identified a pattern by which prime numbers occur which is in the form: N = A(P,n) + B …where A is a function of a ...
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### Can multiple pairs of primes produce the same semiprime?

What I mean by this is, say we have a semi prime number SP1 = P1 * P2, is it possible for SP1 to also be the product of some other pair of primes, say Px * PY? Or ...
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### prime number (a form like Mersenne primes)

I found a form like Mersenne prime number and i wanted to be sure if its maybe better but i was wrong but still as good as Mersenne form its $(2^p+1)/3=P$ and p,P are primes P also can be a ...
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### Prove this formula relating number of primes and semi-primes?

I think I have a messy proof which enables me to state for all $m > 2$ being a prime number: $$\sum_{k=2}^{m-1} \pi(2k) - m+2 = \pi(m)+2S(m^2)$$ Where $\pi(x)$ is a function which counts the ...
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