We found one dictionary that defines the word arithmetical numbers:

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1. Arithmetical numbers: Wikipedia, the Free Encyclopedia

▸ Words similar to arithmetical numbers ▸ Usage examples for arithmetical numbers ▸ Idioms related to arithmetical numbers ▸ Wikipedia articles (New!) ▸ Words that often appear near arithmetical numbers ▸ Rhymes of arithmetical numbers ▸ Invented words related to arithmetical numbers