All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars
 perplexus dot info

 Oddday (Posted on 2015-08-10)
Odd day occurs when three consecutive odd numbers make up a date e.g. 09/11/13 (last o.d. in a dd/mm/yy format).

1. How many times a century does it happen?
2. What is the longest period of time between 2 successive odd days?

Comments: ( Back to comment list | You must be logged in to post comments.)
 No math on vacation | Comment 1 of 4
Just arrived back from vacation, so I'll start with an easy problem:

1) Five times per century.

01/03/05
03/05/07
05/07/09
07/09/11
09/11/13

2) The longest period of time between successive odd days is between 09/11/13 and 01/03/05 in the next century.  We want to pick up the extra leap day that occurs every 400 years (in 2000 but not 1900 or 2100).

When I ask my Oracle database, it says that 09/11/1913 to 01/03/2005 is 33,293 days

 Posted by Steve Herman on 2015-08-11 09:42:04

 Search: Search body:
Forums (0)
Random Problem
Site Statistics
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox: