Two years ago, just before Christmas, I examined the mathematics of The 12 Days of Christmas.
This year, singingbanana, whom you may remember from the 15 Puzzle Challenges post earlier this month, gives us a great new way to visualize triangular numbers in a very Christmasy fashion:
Of course, if you like your Christmas geekery taken to extremes, check out the Singing House of Sioux Falls, SD:
I wish you all a merry Christmas, and a happy new year!
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