Information as of 2020-03-29: Collecting data or work done for Riesel primes k<300

Williams primes of the form 9•10n-1

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Current data

Base : 10
Count : 21
Max n : 1,000,000
Date : 2016
1, 3, 7, 19, 29, 37, 93, 935, 8415, 9631, 11143, 41475, 41917, 48051, 107663, 212903, 223871, 260253, 364521, 383643[1], 1009567[2]
Remarks :
These primes are Near-repdigit numbers; sequence A056725 in OEIS; Search-limit is unsure!!!

Notes

  1. found 2011-01-07, D. Broadhurst
  2. found 2016-09-19, P. Kurtovic

History

2016-09-19: found n = 1009567, P. Kurtovic
2011-01-07: found n = 383643, D. Broadhurst
2010-12-19: found n = 364521, D. Broadhurst
2010-11-05: found n = 260253, D. Broadhurst
2010-11-09: found n = 223871, D. Broadhurst
2010-11-04: found n = 212903, D. Broadhurst
2004-01-21: found n = 107663, J. Sun
2000-12-10: found n = 48051, H.Dubner
2002-01-23: found n = 41917, E. J. Sorensen
2000-10-27: found n = 41475, D. Augustin
1994-12-01: found n = 11143, H.Dubner
1994-10-01: found n = 9631, H.Dubner
1994-10-01: found n = 8415, H.Dubner
?: found n = 935; Wilson