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Zander's user avatar
Zander's user avatar
Zander
  • Member for 10 years, 7 months
  • Last seen more than 2 years ago
17 votes
2 answers
502 views

Are there $a,b>1$ with $a^4\equiv 1 \pmod{b^2}$ and $b^4\equiv1 \pmod{a^2}$?

12 votes
1 answer
329 views

Can $p^{q-1}\equiv 1 \pmod {q^3}$ for primes $p<q$?

8 votes
0 answers
323 views

Close power towers

6 votes
2 answers
276 views

Does $f'(x) = f(\ln(x))$ have an easily expressed solution?

6 votes
2 answers
648 views

When is Chebyshev's $\vartheta(x)>x$?

5 votes
0 answers
139 views

Approach to elliptic curve $y^2=x^3+1/4+p/a^2$

4 votes
1 answer
1k views

Locus of vertex of parabolas through three points

3 votes
2 answers
258 views

Find a divisor satisfying a given congruence

2 votes
0 answers
53 views

Function from a limit of a trigonometric sequence

2 votes
1 answer
101 views

How is $\Vert x \Vert_3$ constrained by $\Vert x \Vert_2$ and $\Vert x \Vert_4$ for $x\in \ell^2$?

2 votes
1 answer
104 views

Show inequality generalization $\sum (x_i-1)(x_i-3)/(x_i^2+3)\ge 0$