We define the N-N's Sequence, as the series of all positive integers in ascending order and with repetition, wherein any number n appears n times. The first few elements of this sequence are as follows:
As you can see, 4 appears 4 times, 7 appears 7 times, appears times, etc...
Write a function that output the number n occuping the position.
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George Berken Augusto Mazzei Mehdi Dehghan Lorenzo

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