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15
Math.TechQA.Club
2013-07-30 02:06:05
463
Views
A question about odd perfect numbers
Published on
30 Jul 2013 - 2:06
#number-theory
#elementary-number-theory
#inequality
#open-problem
#functional-inequalities
275
Views
$f$ has to be open or closed map?
Published on
25 Mar 2026 - 19:01
#general-topology
#compactness
#open-problem
#closed-map
12.1k
Views
Are there open problems in Linear Algebra?
Published on
25 Mar 2026 - 12:52
#linear-algebra
#matrices
#soft-question
#open-problem
#algebraic-k-theory
384
Views
Can an odd perfect number be divisible by $101$?
Published on
15 Aug 2013 - 6:50
#number-theory
#elementary-number-theory
#arithmetic-functions
#open-problem
#perfect-numbers
934
Views
Apery's constant
Published on
01 Oct 2013 - 18:38
#irrational-numbers
#open-problem
85
Views
will $x_{n+1}=x_n/2$ if $x_n$ is even; otherwise $x_{n+1}=3*x_n+1$, will $x_n$ shrink to 1?
Published on
07 Oct 2013 - 1:10
#number-theory
#elementary-number-theory
#open-problem
1.7k
Views
Why are these geometric problems so hard?
Published on
20 Oct 2013 - 17:14
#geometry
#recreational-mathematics
#puzzle
#open-problem
#packing-problem
4.6k
Views
Why Goldbach's conjecture is difficult to prove?
Published on
01 Nov 2013 - 12:03
#soft-question
#open-problem
#conjectures
849
Views
When is a number like "ddd...ddd"+1 (where d is a digit) a perfect square or a prime?
Published on
02 Nov 2013 - 1:13
#elementary-number-theory
#prime-numbers
#divisibility
#open-problem
#square-numbers
495
Views
Collatz conjecture and related problems - mathematical machinery
Published on
10 Dec 2013 - 17:27
#elementary-number-theory
#soft-question
#open-problem
#collatz-conjecture
82
Views
$q\sin q$ is small
Published on
12 Dec 2013 - 12:16
#open-problem
197
Views
A light beam enters a closed room. What is the maximal number of reflections?
Published on
16 Dec 2013 - 10:17
#geometry
#physics
#open-problem
#reflection
2k
Views
Is there any hope to disprove Goldbach's conjecture?
Published on
20 Dec 2013 - 10:45
#open-problem
214
Views
Which precision would be needed?
Published on
28 Dec 2013 - 5:49
#number-theory
#open-problem
#tetration
2.2k
Views
Perfect cuboid cube
Published on
30 Dec 2013 - 17:17
#geometry
#open-problem
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