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Answers
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28
Number of elements in the set {1,…,n}*{1,..,n}
27
Examples of seemingly elementary problems that are hard to solve?
22
Combinatorial interpretation of ${i\choose n}$, where $i^2=-1$
21
On prime numbers
18
Every prime number > 19 divides one plus the product of two smaller primes?
17
Knight tour prime (conjecture)
17
Using Quotient of Prime Numbers to Approximation Reals
16
Series whose convergence is not known
15
Does Zhang’s theorem generalize to $3$ or more primes in an interval of fixed length?
13
Primes with more ones than zeroes in their Binary expansion
12
An application of Mobius Inversion in a paper of Shintani
11
Which Fibonacci numbers are the sum of two squares?
10
Binomial coefficient in Andrews' partition book
8
The tightest prime zipper
8
which integers take the form x^2 + xy + y^2 ?
7
q-Pochhammer Symbol Identity
7
Contest problems with connections to deeper mathematics.
7
Teaching undergraduate students to write proofs
7
Median largest-prime-factor
6
Why is the Chebyshev function relevant to the Prime Number Theorem
6
averages of Euler-phi function and similar
6
Is the Cheeger constant of an induced subgraph of a cube at most 1?
5
There are two points on the Earth’s surface that … ?
5
Problems with the divisor function in a summation
5
Reference for the expected number of prime factors of n larger than n^alpha is -log alpha
4
Simplifying the expression involving instances of Gamma function
4
Density of a set of integers
4
an equation in fractions
3
Better error bounds for partial sums of reciprocals of primes?
3
Recovering $\sum_{n \leq x} a(n)$ from $\sum_{n \leq x} a(n)e^{-n/x}$
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