17

This number is a prime.

Just showing those entries submitted by 'Green': (Click here to show all)

A small prime price (List Price: $17.00) for a great, not-so-trivial, prime book: "Prime Curios! The Dictionary of Prime Number Trivia" by Chris K. Caldwell and G. L. Honaker, Jr. [Green]

It has been proven (January 2012) by Gary McGuire and his collaborators of University College Dublin that 17 is the fewest number of clues that can be provided in a Sudoku puzzle that will lead to a unique solution. [Green]

(There are 6 curios for this number that have not yet been approved by an editor.)