Latteral thinking puzzle
Complete this finite series.
5, 1 , 2, 5 , 7,... Spoilerise the important parts of your answers. 
No takers? I will reveal the next element in the series.

Next element is : 3
again this is a finite series. This is a lateral thinking problem, so you can never solve it with math (although math can help). 
There are [spoiler]12[/spoiler] elements in this series.

Obviously nobody is interested......
So here is the answer: [spoiler]Numeric representation of the day of the week for the first day of the month for this year.[/spoiler] 
I use a shifted version of that sequence to quickly calculate the day of the wee for any day.
1, 4, 4, 0, 2, 5, 0, 3, 6, 1, 4, 6 is easy to remember 144, 025, 036, 146 Add the number of the day in the month and also 2 for 2003, 4 for 2004, 5 for 2005, 6 for 2006, 0 for 2007 calculate the result mod 7, then convert 0 for saturday, 1 for sunday, 2 for monday... 
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