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Riesel primes of the form 391581•2n-1

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Current data

k , b : 391581 , 2
Type : 3
Count : 42
Nash : 2267
Max n : 4,000,000
Date : 2024-07-06
7, 14, 41[1], 53, 71, 173, 194, 334, 473, 994, 1489, 1919, 2047, 2399, 2501, 2825, 4145, 4867, 5026, 5555, 5569, 5834, 22778, 27229, 29846, 34109, 39383, 51926, 56690, 61205, 212173, 216193[2], 219371, 234725, 258493, 572861, 952054, 1189658, 1210958, 1852685, 2217203, 2284871
Remarks :
391581*2^216193-1 was the largest known prime from 1989-08-06 to 1992-02-19 and the only largest non-Mersenne prime since 1951.
See additional info at Amdahl Six and Landon Noll's page.

Notes

  1. Twin n=41
  2. World record prime at time of discovery.

History