07/16/2021

For those familiar with American history, the first nine digits [of e] after the decimal point can be remembered by e = 2.7 (Andrew Jackson)2, or e = 2.718281828 …, because Andrew Jackson was elected President of the United States in 1828. For those good in mathematics, on the other hand, this is a good way to remember their American history.

— Eli Maor, E