Crazy Summations

Number Theory Level pending

If \(a_n= \sum\limits_{k=1}^n k\), \(b_n = \sum\limits_{k=1}^n a_k\) and, \(c_n = \sum\limits_{k=1}^n b_k\).

Find \((c_{2015})^{2015} \mod{99}\)

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