353

Answers
votes newest views recent
26
How many products specify a sum?
22
Longest coinciding pair of integer sequences known
19
Open problems with monetary rewards
16
How many collections of subsets of {1,2,…,n} are closed under the superset operation?
16
Status of the 196 conjecture?
15
Covering $\mathbb{N}$ with prime arithmetic progressions (2)
14
number of partial orders modulo a fixed number
14
Integer-valued factorial ratios (2)
13
$\prod_{n=1}^{\infty} n{}^{\mu(n)}=\frac{1}{4 \pi ^2}$
12
Why is $\frac{\sqrt{6}}{32}(29 + \sqrt{145}) \approx \pi$ ?
11
Is there a 7-regular graph on 50 vertices with girth 5? What about 57-regular on 3250 vertices?
11
What are conjectures that are true for primes but then turned out to be false for some composite number?
10
question in prime numbers
10
primitive roots and primes
10
Who first proved that the value of C/d is independent of the choice of circle?
10
Exceptional points for generalized north-eastern knight walks in a quarter plane
9
Are “almost all” strongly regular graphs rigid?
9
How long can this string of digits be extended?
8
Cohen and Selfridge’s proof about odd numbers which are neither the sum nor difference of a power of two and a prime.
8
Old books still used
8
The distribution of balls in a Bean Machine that omits all the “prime pegs”?
8
Isolated zero set of real polynomial in two variables
8
Can the number of solutions $xy(x-y-1)=n$ for $x,y,n \in Z$ be unbounded as n varies?
8
Consecutive numbers with n prime factors
8
Can we actually find any fixed points with Brouwer’s theorem?
8
Intuition Behind a Decimal Representation with Catalan Numbers
7
Is it possible to have t triangles in some graph on n vertices? (2)
7
Proto-Euclidean algorithm
7
A system of equations for integers
7
How many elements with a hamming distance of 3 or less?
1 2 3 4 5 … 12 next