Figure3:哥德巴赫 证明2(Goldbach,1730)费马数Fn=22”+1,n≥0两两互素！为什 么？因为下式 +1=ΠA+2,n≥0 k=0 归纳简！ 6Figure 3: ①✙♥â ②➨2(Goldbach➜1730) ↕êêFn = 22 n + 1, n ≥ 0 üü♣❷➐➃➓ ♦➸Ï➃❡➟ Fn+1 = Yn k=0 Fk + 2, ∀n ≥ 0 ✽❇④➐ 6