Voronoi Diagrams of the Ulam Prime Spiral


The table below shows the primes that have 'rounder' Voronoi cells than any smaller prime. I conjecture that this sequence is an infinite sequence - that is, there's no 'roundest' voronoi cell. If you aren't sure what all this means, check out the explanation on the main page on this topic.

p"Centre"#VerticesVertex ListAreaPerimeter(P/2)2/A
2(1,0)5
(3

2
,1

2
)(3

2
,-3

2
)(1

6
,-5

6
)(-1

4
,0)(0,1

2
)
61

24
7

2
+4

3
5
4.132018689726583
3(1,1)5
(0,1

2
)(3

2
,1

2
)(2,1)(1

2
,5

2
)(0,7

3
)
65

24
10

3
+22+1

6
10
4.1298586647841296
5(-1,1)6
(-2,1)(-1,0)(-1

4
,0)(0,1

2
)(0,7

3
)(-1

2
,5

2
)
157

48
31

12
+5

2
2+1

4
5+1

6
10
3.967721553536328
37(-3,3)5
(-4,3)(-4,4)(-3,5)(-3

2
,7

2
)(-3,2)
17

4
1+52
3.831890330807703
61(0,4)7
(0,5)(-3

2
,7

2
)(-1

2
,5

2
)(0,7

3
)(1

2
,5

2
)(1,3)(1,5)
55

12
3+32+1

3
10
3.7546790434997863
67(-4,2)8
(-5,2)(-5,1)(-9

2
,1

2
)(-4,1

3
)(-7

2
,1

2
)(-3,1)(-3,2)(-4,3)
23

6
2+32+1

3
10
3.4723249554225166
10243(51,-9)8
(52,-9)(101

2
,-21

2
)(340

7
,-69

7
)(339

7
,-64

7
)(49,-8)(50,-7)(51,-7)(52,-8)
61

7
2+7

2
2+4

7
5+9

14
10+1

7
26
3.4642618196721773
10243(51,-9)8
(52,-9)(101

2
,-21

2
)(340

7
,-69

7
)(339

7
,-64

7
)(49,-8)(50,-7)(51,-7)(52,-8)
61

7
2+7

2
2+4

7
5+9

14
10+1

7
26
3.4642618196721773
11087(53,9)10
(51,10)(51,35

3
)(52,12)(161

3
,12)(223

4
,43

4
)(447

8
,83

8
)(166

3
,23

3
)(54,7)(105

2
,15

2
)(103

2
,17

2
)
299

16
10

3
+2+2

3
5+35

24
10+13

24
26+5

12
34
3.4425149109627373
15199(62,8)9
(60,7)(60,29

5
)(184

3
,5)(63,5)(129

2
,13

2
)(65,22

3
)(65,9)(255

4
,41

4
)(243

4
,37

4
)
2371

120
68

15
+11

4
2+7

4
10+13

30
34
3.4377179873404042
16763(65,57)3
(66,55)(336

5
,55)(203

3
,172

3
)
101

15
6

5
+5

3
2+7

15
26
1.3085199697006535
15199(62,8)9
(60,7)(60,29

5
)(184

3
,5)(63,5)(129

2
,13

2
)(65,22

3
)(65,9)(255

4
,41

4
)(243

4
,37

4
)
2371

120
68

15
+11

4
2+7

4
10+13

30
34
3.4377179873404042
16529(-48,-64)5
(-50,-63)(-49,-62)(-46,-62)(-271

6
,-377

6
)(-136

3
,-191

3
)
127

12
3+11

6
2+4

3
5+1

6
26
2.097909477057046
15199(62,8)9
(60,7)(60,29

5
)(184

3
,5)(63,5)(129

2
,13

2
)(65,22

3
)(65,9)(255

4
,41

4
)(243

4
,37

4
)
2371

120
68

15
+11

4
2+7

4
10+13

30
34
3.4377179873404042
17471(-66,20)9
(-129

2
,41

2
)(-64,19)(-65,18)(-67,17)(-338

5
,17)(-69,58

3
)(-69,21)(-67,22)(-131

2
,43

2
)
521

30
34

15
+22+25+10+7

15
34
3.436491442936181