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Bojan Serafimov

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visits member for 5 months
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423 reputation
 bio website visits member for 5 months
7 badges
 location seen 6 hours ago
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5 Questions

views newest activity votes
 
6
votes
1
answer
129
views

$x^4 + y^4 = z^2$

elementary-number-theory contest-math
jan 12 at 21:22 Brian M. Scott 162k
1
4
votes
2
answers
121
views

having trouble with this well known fact $ab | a^2 + b^2 +1 =>a^2 + b^2 +1 = 3ab $

number-theory contest-math
jan 12 at 0:25 Calvin Lin 11k
 
3
votes
4
answers
294
views

Trying to find $\sum\limits_{k=0}^n k \binom{n}{k}$ [duplicate]

combinatorics binomial-coefficients
jan 14 at 18:09 Mike Spivey 26.1k
 
1
vote
1
answer
60
views

$ A = x + y + z$, number of solutions in $Z$ if $x, y, z$ are bounded in intervals

combinatorics integer-programming
jan 11 at 13:56 Bojan Serafimov 423
 
0
votes
1
answer
42
views

'skew' in geometry

geometry
jan 14 at 2:41 bubba 4,977
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