ta có
c = [TEX](2+1)(2^2+1)(2^4+1)(2^8+1)(2^{16}+1)-2^{32}[/TEX]
c = [TEX](2-1)(2+1)(2^2+1)+(2^4+1)(2^8+1)(2^{16}+1)-2^{32}[/TEX]
c = [TEX](2^2-1)(2^2+1)(2^4+1)(2^8+1)(2^{16}+1)-2^{32}[/TEX]
c = [TEX](2^4-1)(2^4+1)(2^8+1)(2^{16}+1)-2^{32}[/TEX]
c= [TEX](2^8-1)(2^8+1)(2^{16}+1)-2^{32}[/TEX]
c = [TEX](2^{16}-1)(2^{16}+1)-2^{32}[/TEX]
c = [TEX](2^{32}-1}-2^{32}[/TEX]
c = -1