Question: How to find 2013th term in this sequence?

December 22 2013 toandhsp 175

2

How to find 2013th term in the sequence 

1, 2, 2, 3, 3, 3, 4, 4, 4, 4, ...?

in which the n-th positive integer appears n times. 

I don't know how to start.

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