| digits | factor | from | B1 | sigma | date | who |
| 54 | 484061254276878368125726870789180231995964870094916937 | (6^43-1)^42+1 | 15e6 | 599841120 | 26 Dec 1999 | N. Lygeros/M. Mizony |
| 50 | 28352547568921790651747638524393003422138037231571 | 3^1179+1 | 3e6 | 2009193935 | 12 Oct 1999 | P. Zimmermann |
| 49 | 2359597690909288137577710805751790832324948920367 | (14^82-1)^81+1 | 4.5e6 | 1656203751 | 28 Oct 1999 | N. Lygeros/M. Mizony |
| 48 | 552044274610152692854436856453869841728449076617 | 6^726+1 | 1e6 | ??? | 25 Mar 1999 | S. Wagstaff |
| 48 | 256553719084709158037786367908923022810690020021 | (183^16-1)^15+1 | 4.5e6 | 1075698061 | 25 May 1999 | N. Lygeros/M. Mizony |
| 47 | 78864221118488847492673738370487700686503702561 | (157^16-1)^15+1 | 3e6 | 2051050390 | 24 Mar 1999 | N. Lygeros/M. Mizony |
| 47 | 53639866668586533056821906301274295479310292221 | 12^495+1 | 3e6 | 1576669673 | 31 Jan 1999 | M. Quercia |
| 47 | 11893530859697450368552460662877818684447475417 | p(22739) | 3e6 | 1724854468 | 22 Nov 1999 | P. Zimmermann |
| 46 | 5878920553871871291270984955318098156844648537 | 2^1029-1 | 36e6 | 2142629688 | 24 Aug 1999 | P. Zimmermann |
| 46 | 3597764176982506745587150886060717612102325001 | 5^595-1 | 11e6 | 1830953668 | 04 Nov 1999 | A. Lynch |