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2014-10-19T15:23:35+03:00
2^{76} +2^{78}+2^{80}=2^{76} +2^{76+2} +2^{76+4}=
2^{76}+2^{76} *2^{2}+2^{76} *2^{4}=2^{76} (1+2^{2}+2^{4})=
2^{76}(1+4+16)=2^{76}*21