How many positive a,b pair solutions are there for the formula below and is there an easy way to find them all?
$$a * b \equiv 1 \pmod{n}$$
Where $a,b,n \in \mathbb{Z}$ and $0 < a \leq b < n$
2026-04-25 04:46:35.1777092395
How many modular inverse number pairs between $0$ and $n$?
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