For each natural number k, let `C_k` denotes the circle with radius k units and centre at the origin. On the circle `C_k`, a particle moves k units in the counter clockwise direction. After completing its motion on `C_k`, the particles moves to `C_(k + l)` , in some well defined manner, where `l gt 0`. The motion of the particle continues in this manner.
Answer the following question based on above passage :
Let l= 1, the particles starts at (1, 0), if the particles crossing the positive direction of the x-axis for the first time on the circle `C_n` then n is equal to