Please Give Me what i want..

Hello,
i must well have been one of those rare member of the board who is asking for questions. Please please please give me few questions so that i can solve at home like any series like

1
12
12321
1234321 with only a single loop(not nested loop nothing..just a simple loop) or any such program

I am one of those rare member who is not asking for solution but asking for few problem statements so that i can kill time at home. Please everybody take an active step and give me as many programming problems as you want but dont give whole complete projects to build i am just in college not a professional programmer. Give me any problem related to link list ,recursion or anything
waiting for the member's reply.Anybody who has some interesting or tricky programming challenge are welcomed..

check out Project Euler

http://projecteuler.net/

Hey friend dra!! i m so pleased with you thanks buddy many many thanks! you solved my problem now i can keep myself engaged with these problems.
Again thanks!!

Try make a sudoku solver

Not actually as hard as it sounds. I'm making one at the moment, and I have only just finished a course which involved recurison and data structures.

Online Judge

More problems than you can shake a stick at. Beware, the difficulty of these problems varies. Some of them are so difficult they've never been solved (and barely even attempted), while others are exceptionally easy.

Contest problems are obviously meant to be used for programming competitions, and the judges typically try to make easy problems sound hard, and the hard problems sound easy, so less experienced programmers try the harder problems first and get tripped up.

You can view the stats for every problem 2, and submit your solutions in a couple different languages. You'll get instant feedback telling you whether your program worked or not.

Thanks arpsmack
will check it out!