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erdos_887.variant_ii
Specification
A question of Erdős and Rosenfeld, who proved that there are infinitely many $n$ with $4$ divisors in $(n^{\frac{1}{2}}, n^{\frac{1}{2}} + n^{\frac{1}{4}})$.
Lean 4 Statement
theorem erdos_887.variant_ii :
Infinite {n : ℤ | (#{ d ∈ Ioo ⌊√n⌋ ⌈√n + n^((1 : ℝ) / 4)⌉ | d ∣ n } = 4)}
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