# 2p‑1 Digits Date Discovered Discovered By Perfect Number 1 22‑1 1 c. 500 BCE Ancient Greek mathematicians 2 1 · (2 2 ‑1) 2 23‑1 1 c. 500 BCE Ancient Greek mathematicians 2 2 · (2 3 ‑1) 3 25‑1 2 c. 275 BCE Ancient Greek mathematicians 2 4 · (2 5 ‑1)
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