Mathematics
Peter Košinár's user avatar
Peter Košinár's user avatar
Peter Košinár's user avatar
Peter Košinár
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Maths, computer-science and security guy. Mostly interested in Number Theory and other discrete maths topics but still remembers a thing or two from the continuous world :-)

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All Questions Answers
Score Newest
answer
30
"Integer average" of two integer numbers
Dec 6, 2014
answer
13
What is the smallest integer $n$>1 such that $n^{5000}+n^{2013}+1$ is prime?
May 22, 2013
answer
12
System of linear equations having a real solution has also a rational solution.
May 17, 2013
answer
12
Identity for $e$ in terms of the Fibonacci sequence.
May 24, 2013
answer
11
Why is NP not equal to P^NP?
Dec 29, 2013
answer
11
Is a finite tiling of 45-45-90 triangles uniquely determined from the resulting union (up to trivial flips)?
Dec 21, 2020
answer
11
Generating all coprime pairs within limits
Jun 17, 2013
answer
10
Why is the Fibonacci ratio though a decreasing function, it is alternating and decreasing?
Jul 10, 2013
answer
9
Narcissistic numbers in other bases
Mar 26, 2014
answer
9
How prove this sum $1+\sum_{n=1}^{\infty}(1+x^n)(\frac{(1-y)(1-yx)(1-yx^2)\cdots(1-yx^{n-1})}{(y-x)(y-x^2)(y-x^3)\cdots(y-x^n)}=0$
May 30, 2014
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Are all counterexamples of OEIS A226181 both Poulet numbers and Proth numbers?

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