A number is missing from the number series below

A number is missing from the number series below. Can you find it ? 84, 155, 258, 399 ,?, 819.

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #22260

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