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Williams primes of the form (b-1)•bn-1, least n-values
Description
Here are shown the least n-value ≥ 1 for any base b with 2 ≤ b ≤ 2049 which generates a Williams prime of the form (b-1)•bn-1.
History
- 2019-06-05: Found n = 23089 (b=1801), Karsten Bonath
Wanted values [searched range]
There are 40 sequences:
- 128 [2450000]
- 233 [250000]
- 268 [500000]
- 293 [200000]
- 383 [200000]
- 478 [200000]
- 488 [200000]
- 533 [200000]
- 554 [200000]
- 665 [200000]
- 698 [200000]
- 779 [200000]
- 863 [200000]
- 878 [200000]
- 932 [200000]
- 941 [200000]
- 1010 [300000]
- 1034 [150000]
- 1145 [100000]
- 1164 [100000]
- 1199 [100000]
- 1253 [100000]
- 1283 [200000]
- 1328 [100000]
- 1353 [100000]
- 1430 [100000]
- 1489 [100000]
- 1493 [100000]
- 1522 [100000]
- 1658 [100000]
- 1683 [100000]
- 1733 [100000]
- 1738 [100000]
- 1745 [100000]
- 1808 [100000]
- 1913 [100000]
- 1928 [100000]
- 1948 [100000]
- 1988 [100000]
- 2018 [200000]
Notes:
- Base 128: Riesel 127•2n-1 (first n-value divisible by 7)
Data
The data file can be found here.
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| Base | n-value |
|---|
