Difference between revisions of "2004 IMO Shortlist Problems/N5"
(Created page with "We call a positive integer alternate if its decimal digits are alternately odd and even. Find all positive integers <math>n</math> such that <math>n</math> has an alternate multi...") |
(No difference)
|
Latest revision as of 04:36, 16 August 2011
We call a positive integer alternate if its decimal digits are alternately odd and even. Find all positive integers such that has an alternate multiple.