4 | Number 4 is considered an unlucky number in Chinese, Korean, and Japanese cultures because it is nearly homophonous to the word "death". In order not to take unnecessary risks, in most hotels in Hong Kong or Mainland China there is no fourth floor to choose in elevators (caring also about superstitious Westerners, the 13th floor is usually skipped as well). | Trivia |

7 | Number of different countries of origin for D|ONE team members. | D|ONE |

1729 | On top of being the famous Hardy-Ramanujan number, and being a sphenic number, 1729 is also the third Carmichael number, after 561 and 1105. A Carmichael number is an integer n where bn-1 = 1 (mod n) for all b that are prime relative to n. All prime numbers have the Carmichael property. | Scientific |

626 | Number of compositions by Mozart listed in the Köchel catalogue. | Trivia |

9'721'368 | The largest decimal number where you can eliminate any digit, and the number formed by the remaining digits are divisible by the eliminated digit. | Interesting but useless info (IBUI) |

4 | Four half-moves are needed for the fastest possible checkmate (known as the Fool's mate). | Trivia |

520 | If you re-arrange things just a little bit, fate may change a lot: Swapping 2 and 5 (see 250) means a significant upgrade: In Mandarin Chinese the number 520 means, "I love you". To make an extra you may also say "520 1314": I love you forever... "13" meaning "this life", "14" meaning "until death" (or "until next life? according to religious preferences). | Trivia |

30 | 30% Probability that the leading digit in many lists of numbers starts with digit 1 (12.5% that it starts with 3). Called Benford's Law. Detected because some pages in logarithm tables looked used more than others. Used in forensic accounting, specifically in fraud detection. | Scientific |

4 | Four colors are needed to color a map so that no two adjacent regions get the same color (four-color theorem). | Scientific |

4 | Number of Poker Events per year organized by D|ONE. | D|ONE |

41444351010 | Dial this number if you have a need for Data Insight. | D|ONE |

42 | This number comes up in many discussions among certain professional circles (e.g., programmers). We are not sure why but we have our best analysts working to find out ;-) | Trivia |

111'111'111 | First number, consisting only of digits 1, which, squared, does not produce a symmetrical result like 11x11 does. | Interesting but useless info (IBUI) |

1193, 1931, 3119, 9311 | First 4 digits Circular Prime Numbers. | Scientific |

8.1 | Days per employee per year invested in training. | D|ONE |

3 | Number of eyes of the Tuatara lizard (lives in in New Zealand). | Interesting but useless info (IBUI) |

142857 | This number rotates itself:
142857 X 1 = 142857
142857 X 2 = 285714
142857 X 3 = 428571
142857 X 4 = 571428
142857 X 5 = 714285
142857 X 6 = 857142
| Scientific |

55 | 55% of human DNA is also found in bananas. | Trivia |

250 | In Mandarin the number 250 (Er Bai Wu) means "moron". Nobody would accept a price or a salary at 250. Explanations about the origin of this expression differ, but a good interpretation seems "on a scale of 1000 you are 250". | Trivia |

1729 | The Hardy-Ramanujan number. The British mathematician G. H. Hardy told this story about the Indian mathematician Srinivasa Ramanujan: "I remember once going to see him when he was ill at Putney. I had ridden in taxi cab number 1729 and remarked that the number seemed to me rather a dull one, and that I hoped it was not an unfavorable omen. "No," he replied, "it is a very interesting number; it is the smallest number expressible as the sum of two cubes in two different ways." This anecdote gave this number its name.
9^3 + 10^3 = 1729 1^3 + 12^3 = 1729
| Scientific |

16005 | amount of revenue in $ Microsoft made in its first year (D|ONE: 114'000 CHF)
| D|ONE |

2005 | Year when D|ONE was established. | D|ONE |

0.000154 | Probability to get a royal flush in Texas hold 'em Poker. | Trivia |

9411 | Distance in kilometers between both D|ONE offices, San Mateo and Zurich. | D|ONE |

4 | The great pyramids in Egypt have moved 4 kilometers with the earth's crust since they were built. | Trivia |

313 | Car number plate of Donald Duck. | Trivia |

0.89 | Schwarzschild radius of the earth. Compacted to 0.89 cm, the earth will become a black hole. | Interesting but useless info (IBUI) |

19 | The G-20 is made up of the finance ministers and central bank governors of 19 countries. www.g20.org | Trivia |

0 | Number of uninteresting natural numbers: If there were uninteresting numbers, there would be a smallest uninteresting number - but the smallest uninteresting number is itself interesting by being so, producing a contradiction. | Trivia |

1729 | Besides being the Hardy-Ramanujan number, 1729 is also a sphenic number because it is the product of three different primes (7*13*19). | Scientific |

10 | Number of clients representing 80% of D|ONE revenues. | D|ONE |

4444 | Pragmatic as the Chinese are, if you take the the "4" (see 4) issue head-on you may turn it into a blessing: 4 times 4 i.e. 4444 means: may you be 4 times lucky in all four seasons. | Trivia |

36y 130d 3h | Average age of D|ONE team members. | D|ONE |