A triangular array of 2016 coins has 1 coin in the first row, 2 coins in the second row, 3 coins

triangular-array

#1

A triangular array of 2016 coins has 1 coin in the first row, 2 coins in the second row, 3 coins in the third row and so on up to N coins in the Nth row. What is the sum of the digits of N?

Answer:

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