The arithmetic sequence a_ia i

a, start subscript, i, end subscript is defined by the formula:
a_1 = -4910a
1

=−4910a, start subscript, 1, end subscript, equals, minus, 4910
a_i = a_{i - 1} + 8a
i

=a
i−1

+8a, start subscript, i, end subscript, equals, a, start subscript, i, minus, 1, end subscript, plus, 8
Find the sum of the first 575575575 terms in the sequence.