unit fraction contains 1 in the numerator. The decimal representation of the unit fractions with denominators 2 to 10 are given:

Euler published the remarkable quadratic formula:

The fraction 49/98 is a curious fraction, as an inexperienced mathematician in attempting to simplify it may incorrectly believe that 49/98 = 4/8, which is correct, is obtained by cancelling the 9s.

3人寄れば文殊の知恵

If the numbers 1 to 5 are written out in words: one, two, three, four, five, then there are 3 + 3 + 5 + 4 + 4 = 19 letters used in total.