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The Number of the Day: 72

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The Keret House, a proposed single-occupancy office and residence in Warsaw, Poland, will be built between two existing buildings and feature an interior width of only 72 centimeters (28.3 inches) at its narrowest point.


Related Fact: The home recently completed by Indian billionaire Mukesh Ambani could fit 2,535 Keret Houses inside of it. At 27 stories and 398,000 square-feet, it is the world’s largest home.


[Sources: Arch Daily and Inhabitat. See previous Numbers of the Day here. ]

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This Puzzling Math Brain Teaser Has a Simple Solution
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Fans of number-based brainteasers might find themselves pleasantly stumped by the following question, posed by TED-Ed’s Alex Gendler: Which sequence of integers comes next?

1, 11, 21, 1211, 111221, ?

Mathematicians may recognize this pattern as a specific type of number sequence—called a “look-and-say sequence"—that yields a distinct pattern. As for those who aren't number enthusiasts, they should try reading the numbers they see aloud (so that 1 becomes "one one," 11 is "two ones," 21 is "one two, one one,” and so on) to figure the answer.

Still can’t crack the code? Learn the surprisingly simple secret to solving the sequence by watching the video below.

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What Number Is The Answer?
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