An example would be to use the number 9. For every number less than 8, the sigma is 1, 3, 4, 7, 6, 10, 8 and 16. ("�"("m"))/"m" is 16/9. ("�"(n))/n is equal to 13/9. 13/9 is less than 16/9. This makes 9 not a superabundant number