On [Mathoverflow](https://mathoverflow.net/a/410815) user [leechlattice](https://mathoverflow.net/users/125498/leechlattice) shows that $h(n) \ll n^{\frac 2 3}$.

Erdős problem 160

On Mathoverflow user leechlattice shows that $h(n) \ll n^{\frac 2 3}$ .

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Problem row: sha256:54072c4ace8b6e5f98b8c7c5421f0ca46e47e250072e6d68da06aca4bdc705f6
Metadata: sha256:541e6b727ec102eab00ff92e25b64552fd1cefb012edd7dc8b2626f5ca1b4e35
Observation: sha256:9c8326e865b6017b103af7611c852a06776d81964979b8ab5a1b800cd550dff6
Content: sha256:11c038f80b8f67a76706f07e050a048c9066b994fe96c9a0dc209ab2a851adb2

Repository: sha256:a956b84c437202e5a02cc9e036a621bd14a302b34a75758115730bdbb77c52a4
Projection: sha256:a4a96441668a9f8b33afbcb3f696a2639f5fae145f36ddc063d7f67d5fb87ce8
Source commit: 36c6d0fef71a3fec84d9dcd5eeca4e22e378f7cb