Replace the question mark with a numberMATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 454
The first user who solved this task is Sanja Šabović.
#brainteasers #math #riddles
John J. Audubon stampIn 1940, a U.S. 1¢ stamp was issued commemorating John James Audubon. The stamp was one of a series of 35 stamps recognizing Famous Americans, including four other scientists and five inventors. A first day of issue ceremony was held by the Post Office Department in St. Francisville, Louisiana, site of the John J. Audubon State Park. He was a self-taught artist and naturalist who illustrated his ornithological books. He was featured on a second stamp in 1985 as part of the Great Americans series. His bird portraits appeared on four later stamps: Columbia Jay (1963, airmail 1967) Long-billed Curlew (one of the Four Centuries of American Art series,1998) and most recently Tanager Birds (American Treasures series, 27 Jun 2002).