Mathematics
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Donald Splutterwit's user avatar
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Donald Splutterwit
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View all questions and answers
All Questions Answers
Score Newest
answer
80
Can we calculate $ i\sqrt { i\sqrt { i\sqrt { \cdots } } }$?
Mar 1, 2018
answer
55
Prove that every positive integer divides a number such as $70, 700, 7770, 77000$.
Oct 8, 2017
answer
35
Why do these paths all have the same length?
Jan 26, 2018
question
34
Is there a closed-form solution for $\sum_{n=1}^{\infty} \sum_{m=1}^{\infty} \frac{1}{nm(3n+m)}$?
Jul 15, 2019
answer
21
If $u_1=1$ and $u_{n+1} = n+\sum_{k=1}^n u_k^2$, then $u_n$ is never a square.
May 14, 2019
answer
18
How to find $x$ given $\log_{9}\left(\frac{1}{\sqrt3}\right) =x$ without a calculator?
Nov 3, 2017
answer
17
Sphere inside of a Sphere
Dec 9, 2019
answer
17
There is a number divisible by all integers from 1 to 200, except for two consecutive numbers. What are the two?
Nov 14, 2019
answer
15
How many pairs of numbers are there so they are the inverse of each other and they have the same decimal part?
Feb 25, 2017
answer
14
What's the expected number of times I have to roll two die until they both sum $7$?
Feb 2, 2018

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