14814...77151 (65087-digits)

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The largest non-Mersenne prime which was the "largest known prime number" at the time of discovery. This prime equals 391581 × 2²¹⁶¹⁹³ - 1, discovered by the Amdahl Six in 1989. [Gudipati]

Submitted: 2026-05-14 05:52:16; Last Modified: 2026-05-14 10:47:19.