# Prime Sets

Author: mathforces
Problem has been solved: 8 times

Русский язык | English Language

Lin wrote all numbers of the form $p_1^x \cdot p_2^y$ in the notebook, where $p_1$ and $p_2$ are different primes, and $x$ and $y$ are non-negative integers not exceeding 5. After that, he circled some and got some set $A$. How many different sets $A$ exist for which for any $n \in A$ it is known that $m \in A$ if $m | n$ and $m \in N$.