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2014-08-11T10:27:54+03:00
S=7+7² +7³+.....+7²⁰⁰⁴

S+7=7+7+7²+7³+....+7²⁰⁰⁴
S+7=7²+7²+7³+........+7²⁰⁰⁴
S+7=7* 7²+7² +7³.......+7²⁰⁰⁴
S+7=7³ +7³+7⁴+.....+7²⁰⁰⁴
.......................................
S+7=7²⁰⁰⁴ ⁺¹  =>S=7²⁰⁰⁴⁺¹ -7