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May
7
revised First number $\ge n$ that is divisible by $k$?
edited tags
May
4
comment $g^q-q$ and $g^q-gq$ are primitive roots modulo $q^2$
Using $g$ and $q$ is confusing!
Apr
26
comment Reduction from Hamiltonian cycle to Hamiltonian path
@graphtheory92: Seems valid to me. What are your concerns?
Apr
17
revised Compute $\int_{0}^{\infty}\frac{x \log(x)}{(1+x^2)^2}dx$
edited tags
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
comment Proving that $\lim_{n\rightarrow\infty}n(a_{n+1}-a_{n})=1 \implies a_n$ diverges to $\infty$
Please use more informative titles.
Apr
17
revised Infinite series $\sum_{n=1}^{\infty}nx^{n+1}$ does not comply to any of my (known) tests
edited title
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 $
edited title
Apr
17
comment How can I find if $\sum_{n=1}^\infty {n! \over 10^n} $ converges or diverges?
Please use more informative titles. The previous title you had, was on par with "Help!".
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 $1$
edited tags
Apr
17
comment Simplifying Sum
@Guest: Using binomial theorem. It is a standard technique. You don't need to know RHS for it.
Apr
16
comment Simplifying Sum
Without the algebra precalculus tag, the left side is $$\int_{0}^{1} (1-x)^n x^m \text{d}x$$ which is a Beta integral...
Apr
14
awarded  Notable Question
Apr
1
awarded  Popular Question
Mar
29
comment Diophantine system of two equations with four variables
+1: More accessible to a 9th grader, than complex numbers I suppose.
Mar
29
answered Diophantine system of two equations with four variables
Mar
28
revised Counting the number of integers $i$ such that $\sigma(i)$ is even.
edited tags
Mar
28
revised Counting the number of integers $i$ such that $\sigma(i)$ is even.
edited tags