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Full Idea
Numbers are classes of classes, and classes are logical fictions, so that numbers are, as it were, fictions at two removes, fictions of fictions.
Gist of Idea
Numbers are classes of classes, and hence fictions of fictions
Source
Bertrand Russell (The Philosophy of Logical Atomism [1918], §VIII)
Book Ref
Russell,Bertrand: 'Russell's Logical Atomism', ed/tr. Pears,David [Fontana 1972], p.129
A Reaction
This summarises the findings of Russell and Whitehead's researches into logicism. Gödel may have proved that project impossible, but there is now debate about that. Personally I think of numbers as names of patterns.