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As a biprime with proper divisors 1, 3 and 7, twenty-one has a prime aliquot sum of 11 within an aliquot sequence containing only one composite number (21, 11, 1, 0); it is the second composite number with an aliquot sum of 11, following 18. 21 is the first member of the second cluster of consecutive discrete semiprimes (21, 22), where the next such cluster is (33, 34, 35).
This fun fact should be really interesting for Trekkies. ... #21. TIL there were just 5 surviving longbows from medieval England known to exist before 137 whole longbows (and 3,500 arrows) were ...
That's why we've gathered another collection of the most interesting and weird fun facts from the TIL community on Reddit. So, si ... #21. TIL in N**i Germany, “whisper jokes” (Flüsterwitze ...
Interesting facts shown as lightbulbs on post-it notes. Like Dr. Seuss once said, “There are so many things you can learn about, ... 21. A man named Ronald MacDonald robbed Wendy’s in 2005.
The interesting number paradox is a humorous paradox which arises from the attempt to classify every natural number as either "interesting" or "uninteresting".
November 21 is the 325th day of the year (326th in leap years) in the Gregorian calendar; 40 days remain until the end of the year. Events. Pre-1600. 164 BCE ...
And the Instagram page ‘Unbelievable Facts’ is one of the best places to do just that. Every day, they share fascinating trivia, building a collection that now includes over 10,000 unique facts.
Twenty-one, XXI or 21 may refer to: 21 (number) One of the years 21 BC, AD 21, 1921, 2021; Films.