Prime Number Magazine runs a free monthly contest for writers to flex their skill at length limits. Published by Press 53, Prime Number holds entries to 53 words and a monthly prompt. Winners are published on the Prime Number website and receive a free book from Press 53. For December, the prompt was to write a 53-word story about ‘chill,’ and the winner was “The Last” by Greg Hill. New judges are named for each month’s contest, and winning authors also get to submit a 53-word bio. The prompt for January is to “write a story about a penny” with the deadline being the final day of the month. Winning stories appear within a week of the contest end. Click here more information about the contest.