This week’s Car Talk puzzler has me stumped.

A student is asked if the following number is a perfect square: 334,912,740,121,562. Crusty knows the answer immediately. What does Crusty know?

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So Brad had a rule that whenever he got confused in his work, and things didn’t make sense anymore, it was time to go to lunch. After the lunch conversation got confusing, and things didn’t make sense anymore, it was time to go back to work.

This week’s Car Talk puzzler has me stumped.

A student is asked if the following number is a perfect square: 334,912,740,121,562. Crusty knows the answer immediately. What does Crusty know?

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Bah. I finally got it. But how long will it take you? (Credit where it’s due: my friend Rob told me the answer. Thanks!)

Ah, I arrived too late. Last digit mathematics is fun.

Any number, raised to the fifth power… well, if you like playing with this stuff you’ll have fun. Elsewise just ignore it.

Jonathan

(my mother was on car talk once. I think they suggested a new husband. Funny guys. But if changing the clutch didn’t work, gotta try changing something else, right?)

You’re giving Duke a bad name! This should not be a stumper. Basic perfect square rule: if it doesn’t end in 0, 1, 4, 5, 6, 9, or 0, it’s not a perfect square.

Or zero!

Don’t forget zero… and go Duke!

This post is getting a lot of traffic. Maybe because if you put the titular number into Google, you get two results: Car Talk’s website, and us.