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27 votes

How does the divisibility graphs work?

elementary-number-theory graph-theory recreational-mathematics divisibility asked Jun 6 at 20:35
math.stackexchange.com

25 votes

Checking if a number is a Fibonacci or not?

number-theory fibonacci-numbers asked Nov 12 '10 at 13:17
math.stackexchange.com

22 votes

Find the number of pairs of positive integers $(a, b)$ such that $a!+b! = a^b$

combinatorics number-theory contest-math asked Feb 5 '12 at 9:22
math.stackexchange.com

21 votes

Proving : $ \bigl(1+\frac{1}{n+1}\bigr)^{n+1} \gt (1+\frac{1}{n})^{n} $

algebra-precalculus inequality asked Sep 15 '11 at 19:06
math.stackexchange.com

20 votes

A pencil approach to find $\sum \limits_{i=1}^{69} \sqrt{\left( 1+\frac{1}{i^2}+\frac{1}{(i+1)^2}\right)}$

algebra-precalculus asked Oct 21 '11 at 19:02
math.stackexchange.com

16 votes

Which is the easiest way to evaluate $\int \limits_{0}^{\pi/2} (\sqrt{\tan x} +\sqrt{\cot x})$?

calculus integral definite-integral asked Jan 18 '12 at 20:59
math.stackexchange.com

14 votes

A “fast” way for computing $ \prod \limits_{i=1}^{45}(1+\tan i^\circ) $?

trigonometry products asked Oct 25 '11 at 19:15
math.stackexchange.com

14 votes

Generating digits of square root of 2

python algorithm numerical-methods sqrt asked Mar 3 '11 at 22:56
stackoverflow.com

13 votes

Significance of $\displaystyle\sqrt[n]{a^n} $?

algebra-precalculus faq asked Dec 5 '10 at 9:58
math.stackexchange.com

13 votes

How many $N$ of the form $2^n$ are there such that no digit is a power of $2$?

combinatorics number-theory contest-math problem-solving asked Jan 2 '12 at 6:14
math.stackexchange.com

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