68 May 2026

). Many mathematicians believe it is the last even number to have this exact property before higher numbers begin having three or more pairs. Because of its factorization (

On an infinite chessboard, there are 68 distinct squares that are exactly three knight's moves away from any starting square. 1968 is famously remembered as a landmark year

1968 is famously remembered as a landmark year of global social and political turbulence, often referred to simply as "68". In restaurant slang, "68" is the opposite of

, 68 is the very last two-digit number to appear for the first time. In restaurant slang

While 69 often gets the attention, mathematicians and number theorists find 68 far more compelling for several reasons.

In restaurant slang, "68" is the opposite of "86" (which means to remove an item from the menu). A "68" means an item is back on the menu or available.