Tagged Questions
4
votes
3answers
433 views
Chameleons Riddle
There are 10 red, 11 blue, 12 green chameleons. Sometimes, two
chameleons meet. If they are the same color, nothing happens. If they
are different colors, they will both change to the third ...
2
votes
0answers
80 views
When does $n^2$ divide $2^n+1$? [duplicate]
Possible Duplicate:
How many rationals of the form $\large \frac{2^n+1}{n^2}$ are integers?
A friend of mine asked me this question over lunch, and it's been a week that I can't do ...
1
vote
1answer
109 views
A rule to determine the crossed out digit
Lets take any integer, $z=abc\cdots$, form the sum of its digits, $a+b+c+\cdots$, subtract this from $z$, cross out any one digit from the result, and denote the sum of the remaining digits by $w$. ...
