Odd multiples of three

How many integers from 11 to 20232023 (inclusive) are both odd and divisible by 33?

Show hints (2)+
  1. Odd multiple of 33 = multiple of 33 that is not a multiple of 66.
  2. 2023/32023/6\lfloor 2023/3\rfloor - \lfloor 2023/6\rfloor.

Answer

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337

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Asked at: Jane Street, Citadel

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