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wendy.krieger
  • Member for 9 years, 1 month
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52 votes
Accepted

Why does my calculator show $2^{-329} = 0?$

23 votes

Zero to the zero power – is $0^0=1$?

16 votes

Calculating $\sqrt{28\cdot 29 \cdot 30\cdot 31+1}$

14 votes
Accepted

The largest number that cannot be made using a combination of $5$ and $11$?

14 votes
Accepted

Four colour theorem in $3$ dimensions?

13 votes

Why $\sqrt{-1 \cdot {-1}} \neq \sqrt{-1}^2$?

11 votes

Volumes of n-balls: what is so special about n=5?

10 votes
Accepted

Are there new possibilities in higher dimensions?

9 votes
Accepted

Count of 3-digit numbers with at least one digit as 9

7 votes

Cube roots of the complex numbers 1+i?

7 votes
Accepted

A question related to $f(n)=n^4+n^2+1$

6 votes
Accepted

There are infinitely many $N$ such that $\frac{N}{2}$ is a perfect square, $\frac{N}{3}$ is a perfect cube, and $\frac{N}{5}$ is a perfect fifth power

6 votes
Accepted

Number of digits and last digit of a number

6 votes

Solutions of $x^2 + 7y^2 = 2^n$ where $x$ and $y$ are odd numbers

6 votes
Accepted

Prove $5(x_1^2+x_2^2+x_3^2+x_4^2+x_5^2)\geqslant(x_1+x_2+x_3+x_4+x_5)^2$

5 votes

Triangle with integral side lengths and $\angle A=3\angle B$

5 votes

Need to prove the sequence $a_n=1+\frac{1}{2^2}+\frac{1}{3^2}+\cdots+\frac{1}{n^2}$ converges

5 votes

What's the best way to measure mathematical ability?

5 votes

Is $83^{27} +1 $ a prime number?

5 votes

Roots of $8x^3-4x^2-4x+1$

5 votes
Accepted

What real number is exactly one less than its cube?

5 votes
Accepted

Square root of 5 in modulo prime field

5 votes

Working out the value of $a^4+b^4$

5 votes
Accepted

$2^{2^n}+5^{2^n}+7^{2^n}$ is always divisible by $39$

4 votes

What remains in a student's mind

4 votes

Carmichael proof of at least 3 prime factors

4 votes

$\pi$ in arbitrary metric spaces

4 votes

Why only compass and straightedge?

4 votes

What are the theorems in mathematics which can be proved using completely different ideas?

4 votes

What are the parts of a logarithm called?

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