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Arithmetic series

The arithmetic sequence aia_i is defined by the formula:
a1=−3a_1 = -3
ai=ai−1−5a_i = a_{i - 1} -5
Find the sum of the first 490490 terms in the sequence.
  • Your answer should be
  • an integer, like 66
  • a simplified proper fraction, like 3/53/5
  • a simplified improper fraction, like 7/47/4
  • a mixed number, like 1 3/41\ 3/4
  • an exact decimal, like 0.750.75
  • a multiple of pi, like 12 pi12\ \text{pi} or 2/3 pi2/3\ \text{pi}