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Friday Fun Thread for December 22, 2023

Be advised: this thread is not for serious in-depth discussion of weighty topics (we have a link for that), this thread is not for anything Culture War related. This thread is for Fun. You got jokes? Share 'em. You got silly questions? Ask 'em.

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I independently derived it, and chose a different location and name for the new month, but it’s fundamentally identical to the IFC, yes. I chose the name Leftober because it’s made from the leftover 2 or 3 days from the other months. Also, from the article:

Every year has 4 equal-length quarters of 91 days, each 13 weeks or 3+1⁄4 months long.

13 is my favorite prime number and 91 my favorite nonprime. It’s 7x13, a semiprime, and the only composite below 100 which can’t be factored by tricks and must be memorized:

  • Multiples of 2 and 5 end in 0,2,4,6,8 and 0,5 respectively
  • Multiples of 3 and 9 have their digits sum to 3,6,9 and 9 respectively
  • 49 is the square of 7 and is typically memorized in the square sequence 0,1,4,9,16,25,36,49,64,81,100,121,144