Optimal wavelength for an interstellar communication laser

The Precursors are looking for recruits for their interstellar army. Obviously they don't need primitives who can only just bang rocks together, so they've set up a test - a beacon, lying above the galactic plane, using pulsed lasers to beam prime numbers (ie a group of three pulses, then a group of five pulses, then seven pulses, etc) towards thousands of stars that may evolve technological life. We have not detected it yet because it lies in the Zone of Avoidance; but that's about to change.

My question is this: Given that the idea is to contact only technological life, and that the signal is blocked by the galactic core (for story reasons), what wavelength of light would the Precursors be likely to use?

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Optimal wavelength for an interstellar communication laser

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