Generalized Cullen primes of the form n•8n+1

Current data

ASCII format : n*8^n+1 Base : 8 Count : 8 Max n : 800,000 Date : 2024-10-25

5, 17, 23, 1911, 20855, 35945, 42816, 749130

Remarks :

The sequence A242178 in OEIS

History

• 2024-10-25: Checked n = 1 - 100000, Gary Barnes, double-check, released
• 2018-08-14: Checked n = 2 - 800000, Serge Batalov, double-check n = 2 - 166666, confirmed by private communication
• 2014: Checked n = 106575 - 166666, Steven Harvey
• 2013-06-10: Found n = 749130, Serge Batalov
• 2004: Checked n = 7629 - 106574, Günter Löh
• 2000: Checked n = 4768 - 7629, Wilfrid Keller
• 1999-12-27: Found n = 35945, Jo Yeong Uk
• 1999-12-13: Found n = 20855, Jo Yeong Uk
• 1999-07-23: Found n = 42816, Kazuyoshi Asao
• 1989: Checked n = 1 - 4768, Harvey Dubner
• 1989: Found n = 1911, Harvey Dubner