Investigating factors
Christison, Alan,Learning and Teaching Mathematics, 2014, 30-31 (2014),
publicationName = "Association for Mathematics Education of South Africa (AMESA)",
issn = "1990-6811",
abstract= "In 2007 the following question appeared in the Third Round of the Junior Section of the South African Mathematics Olympiad:

"The sum of the factors of 120 is 360. Find the sum of the reciprocals of the factors of 120.""
language="English",
type="Journal Article"