n Here’s a number fact you didn’t know: 73,939,133 is the largest known prime number that remains a prime number as its rightmost digits are removed one at a time, “right” down to 7,393, 739, 73 and 7.

Electrolux is the world’s largest manufacturer of appliances for home and professional use. Besides vacuums, its brands include Frigidaire, Tappan and Kelvinator. Where is the company’s headquarters?

A) Sweden

B) South Korea

C) Canada

D) England

Thursday’s answer: The most valuable item ever featured on PBS’ “Antiques Roadshow” was a 19th-century Navajo chief’s blanket, worth at least $500,000.