"Euler" Quotes from Famous Books
 ... night, and the next morning there was another surprise for me. Gretchen's brother was the pastor of a little church just above them; I must not go without seeing him, Gretchen said. How could I? Euler was my classmate; together we labored for knowledge, and our first manly sympathies run ...
— Scenes in Switzerland • American Tract Society
... adds 12, then transfers 121 (the square of 11), as desired, which leaves 173, a prime number. The key to the puzzle is the curious fact that any number up to 39, if added to its square and the sum increased by 41, makes a prime number. This was first discovered by Euler, the great mathematician. It has been suggested that the banker might desire the customer to transfer sufficient to raise the contents of the box to a given number; but this would not only make the thing an absurdity, but breaks the rule ...
— Amusements in Mathematics • Henry Ernest Dudeney |
