sum of the 7th power of n consecutive natural number

Sum of the seventh power of first  n natural number is given by the formula

\[\sum_{n=1}^{n}n^7=1^7+2^7+3^7+..........+n^7\]

Example \[\sum_{n=1}^{2}n^7=1^7+2^7=129\]

               \[\sum_{n=1}^{3}n^7=1^7+2^7+3^7=2316\]

              \[\sum_{n=1}^{4}n^7=1^7+2^7+3^7+4^7=18700\]

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