Fermat Numbers (2N+1, N is a power of 2)


ECM status
Digits in factor2530354045505560
Bound #150,000250,0001,000,0003,000,00011,000,00044,000,000110M(B2=9.6e11)260M(B2=2.3T)
Curves to test3007001800520010600193002015849468
F12 - 4096DoneDoneDoneDoneDoneDone0+20002485
F13 - 8192DoneDoneDoneDoneDoneDone
F14 - 16384DoneDoneDoneDoneDoneDone400
F15 - 32768DoneDoneDoneDoneDone4347+150
F16 - 65536DoneDoneDoneDoneDone150
F17 - 131072DoneDoneDoneDone85126
F18 - 262144DoneDoneDoneDone1602
F19 - 524288DoneDoneDone10021
F20 - 1048576DoneDoneDone20+5
F21 - 2097152DoneDone1001
F22 - 4194304DoneDone50
F23 - 8388608Done73+80
F24 - 16777216121+2521+10
F25 - 335544323+46


P-1 status
ExponentBound #1Bound #2
F12 - 409624B500T
F13 - 819220B100T
F14 - 1638420B100T
F15 - 3276820B100T
F16 - 655364290M4290M
F17 - 13107264M4290M
F18 - 2621444000M4000M
F19 - 524288100M4200M
F20 - 104857650M6000M
F21 - 209715230M6000M
F22 - 419430450M6000M
F23 - 83886088M6000M
F24 - 167772166M6000M
F25 - 335544321M20M
F26 - 6710886410M10M


Factors found thusfar


None


Last updated: December 21, 2007