Saturday, January 28, 2012

Replacing number on the board

In a blackboard, the number 2012 is initially written. On each turn, the student can choose on of the three numbers: 6, 1006, 1509, and multiply it with the existing number on the board. The existing number is then erased and replaced with the new product.

The teacher has a specific integer $k > 1$ in mind, and the goal for the student is to get the number of the board to have form $n^k$ where $n$ is an integer.

Determine all values of $k$ such that, after a finite number of turns, the number of the board will have the desired form.

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