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Term: n • 2n + 1 Exhaustive-search-table, see b = 2 Total: 16 Reference: PrimePages |
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| Number | Digits | When? | Who? |
|---|---|---|---|
| 6679881 • 26679881 + 1 | 2010852 | Aug 2009 | Magnus Bergman, PrimeGrid |
| 6328548 • 26328548 + 1 | 1905090 | Apr 2009 | Dennis R. Gesker, PrimeGrid |
| 1354828 • 21354828 + 1 | 407850 | Aug 2005 | Mark Rodenkirch |
| 481899 • 2481899 + 1 | 145072 | Sep 1998 | Masakatu Morii |
| 361275 • 2361275 + 1 | 108761 | Jul 1998 | Darren Smith |
| 262419 • 2262419 + 1 | 79002 | Mar 1998 | Darren Smith |
| 90825 • 290825 + 1 | 27347 | May 1997 | Jeffrey Young |
| 59656 • 259656 + 1 | 17964 | May 1997 | Jeffrey Young |
| 32469 • 232469 + 1 | 9779 | May 1997 | Masakatu Morii |
| 32292 • 232292 + 1 | 9726 | May 1997 | Masakatu Morii |
| 18496 • 218496 + 1 | 5573 | Dec 1984 | Wilfrid Keller |
| 6611 • 26611 + 1 | 1994 | Dec 1984 | Wilfrid Keller |
| 5795 • 25795 + 1 | 1749 | Dec 1984 | Wilfrid Keller |
| 4713 • 24713 + 1 | 1423 | Dec 1984 | Wilfrid Keller |
| 141 • 2141 + 1 | 45 | 1958 | Raphael Mitchel Robinson |
| 1 • 21 + 1 | 1 |