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The Number of the Day: 200 Million

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In the 30+ years since Sony introduced the Walkman personal cassette unit, the company has sold more than 200 million of the devices. Sony announced recently that they have permanently halted the sale of cassette Walkmans.


Related Fact: In another bittersweet moment for nostalgic computer lovers everywhere, Sony also announced this year that it will soon discontinue the sale of computer floppy disks.

[Source: Crunch Gear. Read Chris Higgins' latest post for more Walkman nostalgia. 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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