Williams primes of the form 11•10ⁿ-1

Reserved! This sequence is currently reserved by: Gary Barnes

Current data

Base :	10
Count :	24
Max n :	150,000
Date :	2024-09-24
Reserved :	Gary BarnesGary Barnes/Reserved

1, 9, 11, 17, 22, 29, 36, 37, 52, 166, 448, 2011, 3489, 4871, 6982, 10024, 16974, 33287, 47364, 58873, 126160, 234424, 382881, 524706

Remarks :

The sequence A111391 in OEIS
See history at Studio Kamada k*10^n-1 form and difficulty 11*10^w-1.

2024-09-24: Reserved by Gary Barnes for n = 100000 - 600000
2024-08-26: Checked n = 2 - 100000, Mark Rodenkirch, double-check n = 2 - 50000, released
2024-08-22: Reserved by Mark Rodenkirch for n = 2 - 100000
2021-09-30: Found n = 524706, Stefano D'Urso
2021-02-19: Found n = 382881, Stefano D'Urso
2020-10-30: Found n = 234424, Stefano D'Urso
2013-09-16: Checked to n = 50000?, Ray Chandler
2013-09-13: Found n = 126160, Predrag Kurtovic
2013-09-13: Found n = 58873, Predrag Kurtovic
2011-03-15: Found n = 47364, Ray Chandler
2011-03-02: Found n = 33287, Ray Chandler
2010-11-15: Found n = 16974, Ray Chandler
2010-10-15: Found n = 10024, Ray Chandler
2005-11-15: Checked n = 1 - 9500, Robert G. Wilson