Only 17% of all 64-bit Integers are products of two 32-bit integers | Hacker News

Hacker News users discussed a mathematical claim that only about 17% of 64-bit integers can be written as the product of two 32-bit integers.

The thread focused on why so many 64-bit values are unreachable, with commenters debating intuition, counting arguments, and edge cases.

The result matters for understanding integer representation limits, multiplication collisions, and how widening arithmetic covers the number space.