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.
March 3, 1997, two triangular
stamps depicting a clipper ship and a stagecoach
Diophantus (ca. 250) is known as
the Father of Algebra. Equations of the type in this challenge
are called diophantine equations.
Algorithm can be used in solving this challenge.