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The Number of the Day: 4.5

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Al Capone, the infamous mobster and convicted tax cheat, spent 4.5 years of his prison sentence at Alcatraz. Capone was transferred to "The Rock" in large part to cut off his communication with the outside world and his former mafia cohorts.

Related Fact:
Alcatraz got its name in 1775 after being referred to as La Isla de los Alcatraces (AKA Island of the Pelicans) by a Spanish naval officer named Juan Manuel de Ayala.

[Source: The History Channel. 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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