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so-called friend Don

You don't forget the first time you see a severed head. Especially if it's your best friend, Don. And especially if he's got a cigar clenched between his teeth, even though the last time you saw your so-called friend Don he said he didn't have any cigars left. -- Jack Handey

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Top Questions
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Top Answers
41
Computing $\prod_p(\frac{p^2-1}{p^2+1})$ without the zeta function?
mathoverflow.net

23
Does the sum $\sum_{n=1}^{\infty}\frac{1}{p_n(p_{n+1}-p_n)}$ converge?
mathoverflow.net

21
Does the least prime factor have a mean of some sort?
mathoverflow.net

16
Hecke equidistribution
mathoverflow.net

16
Roots of unity near 1 in Z / p Z
mathoverflow.net

15
A naive question about the prime number theorem
mathoverflow.net

13
Are primes of density 0 in $a\cdot b^n+c$?
mathoverflow.net

13
How frequently is 3 a cubic residue mod primes in an arithmetic progression?
mathoverflow.net

11
Sum of the reciprocals of radicals
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11
Existence of relative Dirichlet density of primes starting with 1
mathoverflow.net

11
Is every number the sum of two cubes modulo p where p is a prime not equal to 7?
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11
Numbers $n$ such that the sum of the divisors of $n$ is a nontrivial power
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11
Are there other integer solutions to the equation $9x^3 -1 = y^3$ besides $(x,y) =(1,2)$ and $(0, -1)$?
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10
Factorizations of cyclotomic polynomials valuated at primes
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10
explicit lower bounds on $|L(1,\chi)|$
mathoverflow.net

10
Proportion of square-free integers $n$ with $\gcd(n,\varphi(n))$ a prime
mathoverflow.net

10
Asymptotics and error terms for an arithmetic function built upon $\omega$ and $\Omega$ functions
mathoverflow.net

10
Does there exist an integer that is both solitary and almost perfect?
mathoverflow.net

10
How often is $2^n-1$ a number with few divisors?
mathoverflow.net

9
About integer polynomials which are sums of squares of rational polynomials...
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9
The density of numbers of the form $p + 2^k$
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9
Squarefree parts of Mersenne numbers
mathoverflow.net

9
Is it possible to show that :for $n \geq 1:\sigma(n!-1) $ never be prime and why $\sigma(n!-1)\bmod 10 $ at most is $0$?
mathoverflow.net

8
Low-prime intervals
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8
Lower bound on Carmichael Function
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8
1/2 Wilson's theorem
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8
Perfect powers in the solutions of a certain Pell equation
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8
Results on the largest prime factor of $2^n+1$
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8
If the natural density (relative to the primes) exists, then the Dirichlet density also exists, and the two are equal
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8
Asymptotics of product of Euler's totient function (A001088)?
mathoverflow.net

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