Empy2's user avatar
Empy2's user avatar
Empy2's user avatar
Empy2
  • Member for 10 years, 5 months
  • Last seen this week
  • Adelaide, Australia
25 votes
1 answer
844 views

Fibonacci-related sum

15 votes
1 answer
796 views

Narcissistic numbers in other bases

9 votes
1 answer
497 views

Guess the number of a liar

9 votes
1 answer
229 views

Binomial sum gives $4^n$

8 votes
2 answers
2k views

Rearrangement of dinner guests

7 votes
1 answer
272 views

How many ways to reach an integer by addition and multiplication

6 votes
0 answers
153 views

For which $(a,b)$ is $(round(an),round(bn))$ a 1-1 function?

5 votes
1 answer
92 views

Sum of factors from consecutive sequence

5 votes
1 answer
5k views

Number of normals from a point to an ellipse

4 votes
2 answers
708 views

Circumradius of a tetrahedron

4 votes
0 answers
153 views

$Z_n \backslash \{0\}$ splits into octets

4 votes
0 answers
438 views

Split $\{1,2,...,3n\}$ into triples with $x+y=4z$

3 votes
0 answers
136 views

Hypercube bisector: Does this alternating sum have a limit?

3 votes
1 answer
517 views

Version of Fitch Cheney's card trick

3 votes
1 answer
147 views

What is the dimension of this fractal curve?

3 votes
1 answer
205 views

How fast does $f_n = \sin f_{n-1}$ approach zero? [duplicate]

3 votes
0 answers
111 views

Typical dimension of eigenspace

3 votes
2 answers
162 views

Lowest score never made

3 votes
2 answers
263 views

seventeen tiles on a torus

2 votes
1 answer
169 views

Average number of $U[0,1]$ random numbers to reach $x$

2 votes
1 answer
96 views

Numbers not of the form $x^2+My^2$

2 votes
0 answers
154 views

Smallest prime p with N a quadratic residue mod p

2 votes
0 answers
418 views

Square pairs in other bases

2 votes
0 answers
78 views

Coloring of small chessboards on the torus

2 votes
1 answer
91 views

Armstrong numbers in base 90

2 votes
0 answers
140 views

Chessboard four-colour theorem

1 vote
1 answer
94 views

Size of a subset of $\mathbb{N}$

1 vote
2 answers
151 views

Split $\{1,...,3n\}$ into triples with $x+y=5z$ - no solutions?

1 vote
2 answers
143 views

Pointless probability

1 vote
1 answer
41 views

Cubic with turning point near zero