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Erdős problem 28

If A⊆NA ⊆ \mathbb{N} is such that A+AA + A contains all but finitely many integers then lim sup⁡1A∗1A(n)=∞\limsup 1_A ∗ 1_A(n) = \infty.

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Problem row
sha256:78a869cacb41a0ad0291080d1ccc4ba85d5255ec9eb06400c10865e169729626
Metadata
sha256:6cf955dae585cbd5dced2d6ce0e1efcdd618700dc94c7b6ca68af2ae2a664b56
Observation
sha256:8c823d621b7e1256c8e47c60a5f1c54c016a5507e6f27b2bab537f6f5f232067
Content
sha256:fc2c2bfdb7aa830216a442a5f5a2b9dc3315f1c67183df39eed658d24af993e8
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sha256:a956b84c437202e5a02cc9e036a621bd14a302b34a75758115730bdbb77c52a4
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sha256:c9d14c459c518937e758918b5897dc3b22f1a55f07739afe99502f5b046c907a
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2415f78e850aeee50afdca525c6f2e0ea606f207
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