Williams primes of the form 4•3n-1

Reserved! This sequence is currently reserved by: Borys Jaworski

Current data

Base : 3 Count : 31 Max n : 1,840,000 Date : 2019-03-01 Reserved : Borys JaworskiBorys Jaworski/Reserved

1, 3, 5, 7, 15, 45, 95, 235, 463, 733, 1437, 1583, 1677, 1803, 4163, 4765, 9219, 9959, 25477, 26059, 41539, 54195, 65057, 74977, 116589, 192289, 311835, 350767, 353635, 416337, 423253

History

• 2009-01-08: Found n = 423253, Borys Jaworski
• 2008-12-14: Found n = 416337, Borys Jaworski
• 2008-05-30: Found n = 353635, Borys Jaworski
• 2008-05-23: Found n = 350767, Borys Jaworski
• 2008-03-08: Found n = 311835, Borys Jaworski
• 1972: Found n = 1 ... 235, Hugh C. Williams, C.R.Zarnke

External links

• Active search, last update post #72
• The sequence A005540 in OEIS
• H.C.Williams, C.R.Zarnke: "Some prime numbers of the forms 2A3^n+1 and 2A3^n-1" Math. Comp. 26 (1972), 995-998