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The Number of the Day: 67

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The Social Security Administration has data on baby names going back to 1880. For the first 67 years, Mary was the most popular female baby name in the United States. Linda finally surpassed her in 1947.


Related Fact: For the first 44 years, John was the most popular name for male newborns. The streak was broken in 1924, when Robert took first place.

[Source: Social Security Administration. 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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