ThmDex – An index of mathematical definitions, results, and conjectures.
Conjecture C17 on D4180: Prime integer sequence
Andrica's conjecture
Formulation 0
Let $p_0, p_1, p_2, \dots \in \mathbb{N}$ be the D4180: Prime integer sequence.
Then \begin{equation} \forall \, n \in \mathbb{N} : \sqrt{p_{n + 1}} - \sqrt{p_n} < 1 \end{equation}
Formulation 1
Let $p_0, p_1, p_2, \dots \in \mathbb{N}$ be the D4180: Prime integer sequence.
Let $n \in \mathbb{N}$ be a D996: Natural number.
Then \begin{equation} \sqrt{p_{n + 1}} - \sqrt{p_n} < 1 \end{equation}