[tex]7^{16}-4^{16}=(7^8-4^8)(7^8+4^8)=(7^4-4^4)(7^4+4^4)(7^8+4^8)=\\=(7^2-4^2)(7^2+4^2)(7^4+4^4)(7^8+4^8)=(7-4)(7+4)(7^2+4^2)(7^4+4^4)(7^8+4^8)=\\=3\cdot11\cdot (7^2+4^2)(7^4+4^4)(7^8+4^8)=33\cdot (7^2+4^2)(7^4+4^4)(7^8+4^8)[/tex]
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[tex]7^{16}-4^{16}=(7^8-4^8)(7^8+4^8)=(7^4-4^4)(7^4+4^4)(7^8+4^8)=\\=(7^2-4^2)(7^2+4^2)(7^4+4^4)(7^8+4^8)=(7-4)(7+4)(7^2+4^2)(7^4+4^4)(7^8+4^8)=\\=3\cdot11\cdot (7^2+4^2)(7^4+4^4)(7^8+4^8)=33\cdot (7^2+4^2)(7^4+4^4)(7^8+4^8)[/tex]