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Williams primes of the form 4•3ⁿ+1

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Reserved! This sequence is currently reserved by: Matthias Baur

Current data

Base :	3
Count :	23
Max n :	1,000,000
Date :	2019-07-28
Reserved :	Matthias BaurMatthias Baur/Reserved

1, 2, 3, 6, 14, 15, 39, 201, 249, 885, 1005, 1254, 1635, 3306^[1], 3522^[2], 9602^[3], 19785, 72698, 233583, 328689, 537918, 887535, 980925

Remarks :

The sequence A005537 in OEIS

Notes

↑ Generalized Fermat
↑ Generalized Fermat
↑ Generalized Fermat

History

2018-07-28: Checked to n = 1000000, Matthias Baur
2019-07-12: Found n = 887535, Matthias Baur
2019-07-10: Found n = 980925, Matthias Baur
2019-06-04: Checked to n = 800000, Matthias Baur
2018-12-06: Checked to n = 600000, Matthias Baur
2005-11-29: Found n = 233583, Boris Iskra
1996-12-01: Found n = 19785, Chris Caldwell
1996-12-01: Found n = 9602, Chris Caldwell
1992: Found n = 3522, Chris Caldwell
1992: Found n = 3306, Chris Caldwell

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