Charles

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http://math.crg4.com/

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Hard code golf: Regex for divisibility by 7

code-golf math regular-expression regex-golf asked Aug 19, 2011 at 20:21

codegolf.stackexchange.com

59 votes

Quality of random numbers

random asked Mar 19, 2012 at 20:52

mathematica.stackexchange.com

48 votes

Sums of prime powers

number-theory algorithms prime-numbers asked Mar 21, 2011 at 2:51

math.stackexchange.com

44 votes

Finding $1/x^2 + 1/x^3 + 1/x^5 + \dots $

sequences-and-series number-theory reference-request numerical-methods prime-numbers asked Jul 1, 2016 at 15:03

math.stackexchange.com

42 votes

Is $n(n+1)$ ever a factorial?

number-theory diophantine-equations asked Jul 19, 2013 at 18:21

math.stackexchange.com

39 votes

Is the Galois group associated to a random polynomial solvable with probability 0?

reference-request finite-groups galois-theory math-history solvable-groups asked Jan 11, 2013 at 18:01

math.stackexchange.com

38 votes

What did Yu Jianchun discover about Carmichael numbers?

nt.number-theory prime-numbers congruences translation asked Jul 21, 2016 at 5:17

mathoverflow.net

36 votes

Checking if two Poisson samples have the same mean

hypothesis-testing poisson asked Apr 14, 2011 at 14:26

stats.stackexchange.com

35 votes

Bit twiddling: which bit is set?

c bit-manipulation asked Aug 12, 2010 at 6:03

stackoverflow.com

34 votes

Status of Harvey Friedman's grand conjecture?

lo.logic asked Sep 21, 2010 at 0:29

mathoverflow.net

Top Answers

262

Does $\pi$ contain all possible number combinations?

math.stackexchange.com

107

Is this of any real importance to the mathematical scientific community?

math.stackexchange.com

Validate that input is in this time format - "HH:MM"

stackoverflow.com

Why does $1/x$ diverge?

math.stackexchange.com

Character limit of a javascript string variable

stackoverflow.com

Has Stirling’s Formula ever been applied, with interesting consequence, to Wilson’s Theorem?

mathoverflow.net

Is there a known mathematical equation to find the nth prime?

math.stackexchange.com

Is there a formal term for "snail mail"?

english.stackexchange.com

Determine whether a number is prime

math.stackexchange.com

Applicability of IBM's projected 50-qubit quantum computer Q to cryptanalysis?

crypto.stackexchange.com

Why does this take so long to match? Is it a bug?

stackoverflow.com

Would a proof to the Riemann Hypothesis affect security?

math.stackexchange.com

Fastest algorithm to compute the sum of primes?

mathoverflow.net

How big is infinity?

math.stackexchange.com

Where did the Chromatic/Metallic Dragons come from?

rpg.stackexchange.com

Can the golden ratio accurately be expressed in terms of $e$ and $\pi$

math.stackexchange.com

Twin primes of form $2^n+3$ and $2^n+5$

math.stackexchange.com

Where did the Romans store their cash?

history.stackexchange.com

Odd-bit primes ratio

mathoverflow.net

Meaning and acceptability of "One fifty" when speaking of dollars

english.stackexchange.com

Match pattern anywhere in string?

stackoverflow.com

Mathematicians ahead of their time?

math.stackexchange.com

Examples of theorems misapplied to non-mathematical contexts

mathoverflow.net

Text compression in JavaScript

stackoverflow.com

Showcase of Languages

codegolf.stackexchange.com

What language is the compiler of Go programming language written in?

stackoverflow.com

Fekete's conjecture on repeated applications of the tangent function

math.stackexchange.com

Is there a symbol to mean 'this is undefined'?

math.stackexchange.com

What is the smallest prime of the form $n^n+8$?

math.stackexchange.com

Do we really know the reliability of PrimeQ[n] (for $n>10^{16}$)?

math.stackexchange.com