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Jan
21
revised Diophantine equation with $gcd = 1$
edited tags
Nov
25
revised Existence of a self-complementary graph
added 268 characters in body
Oct
2
revised The Modified Faro shuffle.
added 52 characters in body
Oct
1
revised Subset of the complex plane with $|z^2-4z+3|\leq 0$
edited tags
Sep
29
revised In probability, does P(A) = P(AB) + P(AB')?
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Sep
11
revised Estimating $\sum n^{-1/2}$
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Sep
11
revised Moebius function log sum
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Jul
21
revised For any integer $n>1$ exist integers $a$ and $b$ so that $\tau(a)+\tau(b)=n$
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Jul
8
revised What is $x$ if $\{x\}+\{\frac{1}{x} \}=1$ ? ({} - fractional part)?
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Jul
8
revised What is $x$ if $\{x\}+\{\frac{1}{x} \}=1$ ? ({} - fractional part)?
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Jul
4
revised If, $x+y=1, x^2+y^2=2$ Find $x^7+y^7=??$
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May
7
revised First number $\ge n$ that is divisible by $k$?
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Apr
17
revised Compute $\int_{0}^{\infty}\frac{x \log(x)}{(1+x^2)^2}dx$
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Apr
17
revised Proving that $\lim_{n\rightarrow\infty}n(a_{n+1}-a_{n})=1 \implies a_n$ diverges to $\infty$
edited title
Apr
17
revised Infinite series $\sum_{n=1}^{\infty}nx^{n+1}$ does not comply to any of my (known) tests
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Apr
17
revised Showing that $\sum\limits_{n=1}^{\infty} (a_1+2a_2+…+na_n)/n(n+1) = \sum\limits_{i=1}^n a_n $
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Apr
17
revised How can I find if $\sum_{n=1}^\infty {n! \over 10^n} $ converges or diverges?
edited title
Apr
17
revised Proof that $\lim \frac{a_n}{1+a_n^2} = 0 \implies \lim a_n = 0$
deleted 2 characters in body; edited title
Apr
17
revised Sum of digits of $11\dots 11^2$ where $11\dots 11$ is a 1992 digit number with all digits $1$
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Mar
28
revised Counting the number of integers $i$ such that $\sigma(i)$ is even.
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