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Figure This!

The price for a first-class stamp on July 6, 1932, was 3¢. It remained at that price until August 1, 1958, when it rose to 4¢.

The price of a first-class stamp changed twice in 1981, to 18¢ in March and to 20¢ in November.

More than 400 commemorative 32¢ stamps were issued from January 1, 1995, through December 31, 1998.

On March 3, 1997, two triangular stamps depicting a clipper ship and a stagecoach were issued.

Diophantus (ca. 250) is known as the Father of Algebra. Equations of the type in this challenge are called diophantine equations.

The Euclidean Algorithm can be used in solving this challenge.
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