Homepage of Yutaka Nishiyama(西山豊)


Boomerang Instructions in 70 Languages
 Last updated 29th July 2015

             Boomerang by Prof Yutaka Nishiyama at river side of Yodo in 1992

Plus online magazine of Cambrigde University, UK

Mysterious Number 6174, Mar 2006
Most popular article!
Winning Odds, June 2010 (C) Unit Fractions, Feb 2012 (C)
50 Visions of Mathematics
May 2014
Circles rolling on circles
May 2014

            Topics   ( Old Topics since Jan 2011 )
No.221 [Book Review] 谷克彦氏による書評 "The Mysterious Number 6174: One of 30 Amazing Mathematical Topics in Daily Life" が掲載されました。< ここ >, 29th July 2015.

No.220 [Unit Frac] "Revisiting Unit Fractions That Sum to 1" is now published HERE , 29th July 2015.

No.219 [Van Aubel] Elegant special cases of Van Aubel's theorem by V. Oxman and M. Stupel refers to my paper HERE, 26th July 2015.

No.218 [Steve Humble] Steve Humble who is my friend sent me his recent activities, Slum Super Stars - African talented children alleviating poverty . | Steve Humble | TEDxNewcastle , The Magical Number Seven, NUMBERS FESTIVAL, The Neighbour Problem, Collins, 25th July 2015.



← World University Ranking Top 127/200 registered "Mysterious Number 6174."

              52 Mathematics in Daily Life  (J):Japanese, (S):Spanish, (C):Chinese, (Wi):Wikipedia

1. Boomerang (J)(Wi)(R)
2. Five Petals (J)
3. Fixed Point (J)(Wi)
4. Boolean Algebra (J)
5. Stroboscope (J)
6. Egg Shape (J) (S)
7. Barcodes (J)
8. Harmonic Series (J)
9. Moebius (J)
10. Hexaflexagon (J)(Wi)
11. Inside out (J)
12. Miura Folding (J)
13. Sepak Takraw (J)(P)
14. Increasing of Area (J)
15. 6174 (J)(Wi)
16. Palindrome 196 (J) (Wi)
17. Oldham Coupling (J)
18. Planimeter (J)
19. Sicherman Dice (J)
20. Montmort Theory (J)
21. Random Number (J)
22. Root 2 (J)
23. Cycloid (J)
24. Machin and Pi (J)
25. Burnside Lem. (J)(Q)
26. Heptadecagon (J)
27. Sudoku (J)
28. Odd and Even (J)
29. Curve & Straight (J)
30. Finger Count (J) (S)
31. Writing Direction (J)
32. Penney Ante (J)(C)(Wi)
33. Flex Geometry (J)
34. Van Aubel (J)(Wi)
35. Red or Black (J)
36. Similarity Trans (J)
37. 52 Cycling Cards (J)
38. Straw Flute (J)
39. Minor Keys (J)
40. Benham's Top (J)
41. 2000 Yen (J)(Wi)
42. Unit Fraction (J)(C)
43. Card Shuffle (J)
44. Kruskal Count (J)(F)
45. Triangle 3 Colors (J) (Q)
46. Fullerene C60 (J)
47. Random dots, Regular
48. 19 faces of HexFlex
49. Wheel Question (Q)(J)
50. 1/998001(J)
51. Zeta function (J)
52. Sepak based C60 (J)

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