k N First prime Date Author 13 1+ 13*2^2+1 Dec 1999 Carlos Rivera 47 3- 47*2^4-1 Dec 1999 Carlos Rivera 59 4+ 59*2^5+1 Dec 1999 Carlos Rivera 109 5+ 109*2^6+1 Dec 1999 Carlos Rivera 241 10- 241*2^11-1 Dec 1999 Carlos Rivera 335 17- 335*2^18-1 Dec 1999 Carlos Rivera 1109 19- 1109*2^20-1 Dec 1999 Carlos Rivera 1373 27- 1373*2^28-1 Dec 1999 Carlos Rivera 1447 69+ 1447*2^70 +1 Dec 1999 Carlos Rivera 14893 105+ 14893*2^106+1 Dec 1999 Carlos Rivera 52267 149+ 52267*2^150+1 Dec 1999 Carlos Rivera 56543 725- 56543*2^726-1 Dec 1999 Carlos Rivera 649603 2905+ 649603*2^2906+1 Dec 1999 Carlos Rivera 838441 7430- 838441*2^7431-1 Dec 1999 Carlos Rivera 8840101 14072- 8840101*2^14073-1 Dec 1999 Carlos Rivera 16935761 22393- 16935761*2^22394-1 Dec 1999 Carlos Rivera 100604613 41421- 100604613*2^41422-1 Jan 2000 Wilfrid Keller (17/1/00) 118373279 82586+ 118373279*2^82587+1 Jan 2000 Wilfrid Keller (17/1/00) 270704167 85460- 270704167*2^85461-1 Jan 2000 Wilfrid Keller (17/1/00) 1355477231 356980+ 1355477231*2^356981+1 Apr 2002 Wilfrid Keller (24/4/02) 12793896433 1385393+ 12793896433*2^1385394+1 Apr 2021 Kellen Shenton 20707410481 1900578- 20707410481*2^1900579-1 Apr 2021 Kellen Shenton (13/4/21) 38118498221 7552806+ 38118498221*2^7552807+1 Oct 2025 Kellen Shenton (7/10/25) 2273633 digits