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Challenge Questions and Puzzles

Have a challenging question or puzzle you want to share with the community? Post it here (homework questions do NOT belong here).
C
CaptainBlack's Problem of the Week #1
Replies
13
Views
3K
caffeinemachine
caffeinemachine
D
infinite sum
Replies
4
Views
2K
Krizalid
Krizalid
S
A challenging Integral
Replies
5
Views
4K
Krizalid
Krizalid
caffeinemachine
Convex hexagon's peculiar property.
Replies
0
Views
2K
caffeinemachine
caffeinemachine
caffeinemachine
(m-1)n+1 persons. m mutual strangers or someone acquainted with n
Replies
0
Views
1K
caffeinemachine
caffeinemachine
caffeinemachine
inf{frac{n*sqrt(3)} : n in integer}=0
Replies
11
Views
4K
caffeinemachine
caffeinemachine
caffeinemachine
Among 2n-1 integers summation of some n of these is divisible by n.
Replies
2
Views
2K
caffeinemachine
caffeinemachine
Random Variable
more integrals
Replies
15
Views
4K
sbhatnagar
S
Also sprach Zarathustra
Integral of x^{-x}
Replies
11
Views
3K
sbhatnagar
S
Alexmahone
Hourglasses
Replies
7
Views
7K
oasi
O
Krizalid
An interesting series divergence
Replies
6
Views
2K
oasi
O
S
infinite series 2
Replies
4
Views
2K
oasi
O
Krizalid
Integral with floor and ceil function
Replies
3
Views
3K
oasi
O
caffeinemachine
pairwise difference of 20 positive integers. At least four of em are equal.
Replies
6
Views
4K
caffeinemachine
caffeinemachine
S
integrals
Replies
7
Views
3K
sbhatnagar
S
Sherlock
Sum involving pi, ln(2) and Catalan's constant
Replies
2
Views
3K
Sherlock
Sherlock
chisigma
A 'not too challenge' question...
Replies
2
Views
2K
chisigma
chisigma
S
a nice problem #2
Replies
4
Views
2K
Krizalid
Krizalid
anemone
Find the exact value of the solution to the equation √ 2+(√ 2-(√ 2+√( 2-x))))=x.
Replies
3
Views
2K
anemone
anemone
S
A nice problem
Replies
3
Views
1K
chisigma
chisigma
S
infinite series
Replies
10
Views
4K
melese
melese
Random Variable
definite integral with four parameters
Replies
2
Views
2K
Random Variable
Random Variable
Random Variable
series involving gamma functions
Replies
1
Views
2K
Random Variable
Random Variable
Krizalid
Compute two series
Replies
5
Views
2K
Sherlock
Sherlock
S
Trigonometric Integrals
Replies
5
Views
3K
PaulRS
PaulRS
S
definite integral
Replies
3
Views
1K
Sherlock
Sherlock
S
more definite integrals
Replies
4
Views
5K
Sherlock
Sherlock
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