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Generalized Repunits of the form (10ⁿ-1)/9

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Current data

Base :	10
Count :	11
Max n :	10,800,000
Date :	2023-05-16

2, 19, 23, 317, 1031, 49081, 86453, 109297^[1], 270343^[2], 5794777^[3], 8177207^[4]

Remarks :

The sequence A004023 in OEIS.
Search history see here.

Notes

History

2023-05-16: Proved prime for n = 86453 by Andreas Enge

2022-03-21: Proved prime for n = 49081 by Paul Underwood

2021-05-08: Found n = 8177207, Ryan Propper, Serge Batalov
2021-04-20: Found n = 5794777, Ryan Propper, Serge Batalov
2007-07-11: Found n = 270343, Maksym Voznyy, Anton Budnyy
2007-03-26: Found n = 109297, Paul Bourdelais, Harvey Dubner
2000-10-26: Found n = 86453, Lew Baxter
2000: Found n = 60000, Harvey Dubner
1999-09-09: Found n = 49081, Harvey Dubner
1998: Checked to n = 45000, Torbjörn Granlund
1994: Checked to n = 30000, Jeffrey Young
1992: Checked to n = 20000, Harvey Dubner
1985: Checked to n = 10000, Harvey Dubner
1985: Proved prime for n = 1031 by Hugh C. Williams, Harvey Dubner

1978: Checked to n = 2000, Hugh C. Williams, Eric Seah
1978: Found n = 1031, Hugh C. Williams, Eric Seah

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Generalized Repunit