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Top Questions
6
votes
Repeated sum of square of digits always arrives at $1$ or $89$
sequences-and-series
elementary-number-theory
number-systems
asked Sep 19, 2016 at 20:20
math.stackexchange.com
5
votes
Find the possible value of $x$ such that $f(x)=K$
number-theory
asked Jun 8, 2017 at 15:57
math.stackexchange.com
Top Answers
10
Is $x^2+x-1$ squarefree?
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8
Expand $\tan^{-1}x$ as infinite series
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7
$a_{n+1}=\frac{a_n}{2}+\frac{2}{a_n}$ for $n \geq 0$. Prove that $a_{n+1} \leq a_n$ for all $n \in \Bbb N$.
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7
Number of positive integer solutions to the following equation
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5
Simple graph with 5 vertices with degree sequence (3,3,3,3,4)
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