| Presidential Equation | Number | Expression |
| Eisenhower + Hoover | |
| Reagan * Tyler | |
| John Q. Adams ÷ John Adams | |
| Lincoln * Jefferson | |
| Clinton - Nixon | |
| Buchanan - William H. Harrison | |
| John Q. Adams2 | |
| Grant2 | |
| Garfield * Coolidge | |
| Hayes - Grant | |
| Washington * Obama | |
| Wilson + Jackson | |
| | Presidential Equation | Number | Expression |
| Tyler * Van Buren | |
| Obama ÷ Madison | |
| Lyndon B. Johnson ÷ Madison | |
| Pierce + √Lincoln | |
| Lincoln - Washington | |
| McKinley + Monroe | |
| George W. Bush - Kennedy | |
| √McKinley | |
| Madison * Monroe | |
| Taylor * John Adams | |
| Polk + Carter | |
| Arthur ÷ Jefferson | |
|