l 0 1 2 3 4 5 F l ≡ 2 2 l + 1 3 5 17 257 65 537 4 294 967 297 p r i m e f a c t o r s 641 ⋅ 6 700 417 G l ≡ 3 ⋅ 2 2 l + 1 7 13 49 769 196 609 12 884 901 889 p r i m e f a c t o r s 7 2 7 ⋅ 28 087 19 2 ⋅ 35 692 249 (3.7)