Your challenge is to write a fic about numbers.
You can interpret that concept as loosely as you want, involving numbers in the plot directly, or just hinting at a broader numerical theme. Any kind of number is allowed! It doesn’t have to be obvious, though whatever numbers you choose should be at the core of your fic. Don’t just throw in a brief mention of numbers to meet the requirement, and then take the story somewhere else. :-)
You’ve got two weeks! Get counting!