Berry's Paradox
"The smallest number that cannot be described in fewer than twelve words." That description is eleven words long.
1906 (published by Russell, crediting Berry); communicated c. 190419 min read
English amateur logic
G. G. Berry
1867 – 1928
George Godfrey Berry, a junior librarian at the Bodleian Library in Oxford. He corresponded with Bertrand Russell and sent him the puzzle about the least integer not nameable in a small number of syllables. Russell published it in 1906 with explicit credit to Berry, and it has carried his name ever since. He published almost nothing under his own name.