in reply to Request help on optimizing a loop for looking up numbers

Maybe you can profit from RFC: The Lazy Manager's Calendar with Inversion Lists.
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ
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