Wagstaff (probable) Primes
Term: (2p + 1) / 3
Total: 44
Exhaustive-search-table, see b = 2
References: PrimePagesMersenneforum
# Number Digits When Who Status on
factordb
PrimePages - ID
44 (215135397 + 1) / 3 4556209 Jun 2021 Ryan Propper PRP
43 (213372531 + 1) / 3 4025533 Sep 2013 Ryan Propper PRP
42 (213347311 + 1) / 3 4017941 Sep 2013 Ryan Propper PRP
41 (24031399 + 1) / 3 1213572 Feb 2010 Tony Reix;Diepeveen-Underwood-Reix PRP
40 (2986191 + 1) / 3 296873 Jun 2008 Vincent Diepeveen PRP
39 (2374321 + 1) / 3 112682 Dec 2000 Henri & Renaud Lifchitz PRP
38 (2269987 + 1) / 3 81274 Oct 2000 Henri & Renaud Lifchitz PRP
37 (2267017 + 1) / 3 80380 Sep 2000 Henri & Renaud Lifchitz PRP
36 (2141079 + 1) / 3 42469 Oct 2025 Henri & Renaud Lifchitz; Paul Underwood; CM Prime 141182
35 (2138937 + 1) / 3 41824 Oct 2023 Andreas Enge; Paul Underwood; CM Prime 136562
34 (2127031 + 1) / 3 38240 Jan 2023 Paul Underwood; CM Prime 134830
33 (2117239 + 1) / 3 35292 Aug 2022 Ryan Propper; CM Prime 134282
32 (295369 + 1) / 3 28709 Aug 2021 Laurent Facq; Jared Asuncion; Bill Allombert Prime 132583
31 (283339 + 1) / 3 25088 Sep 2014 Tom Wu; Primo Prime 118512
30 (242737 + 1) / 3 12865 Aug 2007 François Morain Prime 82071
29 (214479 + 1) / 3 4359 Nov 2004 David Broadhurst; Primo Prime 74683
28 (212391 + 1) / 3 3730 May 1996 François Morain Prime 27688
27 (211279 + 1) / 3 3395 Jan 1998 Preda Mihailescu Prime 28909
26 (210691 + 1) / 3 3218 Oct 2004 David Broadhurst; Primo Prime 74682
25 (210501 + 1) / 3 3161 May 1996 François Morain Prime 29287
24 (25807 + 1) / 3 1748 1998 Preda Mihailescu Prime 72546
23 (23539 + 1) / 3 1065 1989 François Morain Prime 54344
22 (22617 + 1) / 3 788 Prime
21 (21709 + 1) / 3 514 Prime
20 (2701 + 1) / 3 211 Prime
19 (2347 + 1) / 3 104 Prime
18 (2313 + 1) / 3 94 Prime
17 (2199 + 1) / 3 60 Prime
16 (2191 + 1) / 3 58 Prime
15 (2167 + 1) / 3 50 Prime
14 (2127 + 1) / 3 38 Prime
13 (2101 + 1) / 3 30 Prime
12 (279 + 1) / 3 24 Prime
11 (261 + 1) / 3 18 Prime
10 (243 + 1) / 3 13 Prime
9 (231 + 1) / 3 9 Prime
8 (223 + 1) / 3 7 Prime
7 (219 + 1) / 3 6 Prime
6 (217 + 1) / 3 5 Prime
5 (213 + 1) / 3 4 Prime
4 (211 + 1) / 3 3 Prime
3 (25 + 1) / 3 2 Prime
2 (27 + 1) / 3 2 Prime
1 (23 + 1) / 3 1 Prime