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Mathematics
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nickgard
  • Member for 7 years, 4 months
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  • United Kingdom
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I'm a keen recreational mathematician particularly interested in number theory.

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35
Convex polygons that do not tile the plane individually, but together they do
Apr 6, 2020
24
Every natural number is covered by consecutive numbers that sum to a prime power.
Jan 12, 2020
23
Polygon-in-polygon testing
May 9, 2017
16
Are there polyominoes that can't tile the plane, but scaled copies can?
Dec 10, 2019
11
If $AM$, $BN$, $CP$ are parallel chords in the circumcircle of equilateral $\triangle ABC$, then $\triangle MNP$ is also equilateral
Dec 29, 2017
10
Is Conway's "Look and Say Sequence" strictly increasing?
Jan 6, 2018
10
What's the closest approximation to $\pi$ using the digits $0-9$ only once?
Jan 4, 2018
7
Is Paley-13 a graceful graph?
Jun 11, 2019
7
If $A=1$, $B=2$, etc, then what word, treated as a product of its letters, has value closest to $1000000$?
Sep 7, 2018
7
Is $4\underbrace{999 . . . 9}_{224 ({\rm times})}$ prime?
Mar 15, 2020
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39
Go forth and ...
17
What Does Igor's Letter Say?
16
An Historical Spoonerism
11
Unlucky tiling: Arrange thirteen right isosceles triangles into a square
7
2019 is coming!