## The Pi Permutation

Explanation:

The Pi Permutation p (N, n, k)

N: Know the first N digits of Pi.

N is a multiple of 10, and we admit N = 10, N = 100, N = 5,000, N = 10,000.

Example N = 10: Know the sequence 1415926535.

n: The task is to know n digits which are chosen at random.

We admit n = 1, n = 2, and n = 10.

Example n = 1: What is the digit no. 4? Answer: 5.

Example n = 2: What is the double-digit no. 4? Answer: 65.

Example n = 10: What is the ten-digit no. 4? Answer: 5028841971.

k: The number of questions to be answered.

For N = 10 we admit only n = 1 and k = 10.

For N = 100 we admit n = 1 and k = 10 or k = 100.

For N = 5,000 we admit n = 1, k = 10, k = 100, k = 500 / n = 2, k = 10, k = 100, k = 2,500 / n = 10, k = 10, k = 100, k = 500.

For N = 10,000 we admit n = 1, k = 10, k = 100, k = 10,000 / n = 2, k = 10, k = 100, k = 5,000 / n = 10, k = 10, k = 100, k = 1,000.

**Offline:**

This memory sport uses a software which you can download for free on www.piworld.de.
The count of the digits can be chosen to your liking from 1 or from 0.

For every question you are allowed one mistake, but not two mistakes. The mistake must be corrected immediately.

**Sport:** The overall time needed to accomplish p (N,n,k) counts.

Records:

Records offline: P (N = 5,000, n = 2, k = 2,500) Ulrich Voigt, 2002, June 28 in Matthias-Claudius Gymnasium in Hamburg-Wandsbek. Time: 6h 5m. Ulrich Voigt, 2003, June 30 in Matthias-Claudius Gymnasium in Hamburg-Wandsbek. Time: 5h 40m. P (N = 100, n = 1, k = 100) Ulrich Voigt, 2006, Nov. 6 in Mathematicum Giessen at the Mental Calculation World Cup. Time: 48,43 s. Ulrich Voigt, 2006, Nov. 6 in Mathematicum Giessen at the mental calculation worls-championship. Time: 48,43 s. Ulrich Voigt, 2009, July 31, University Hamburg at the German Memory Championships. Time: 44.25s Ulrich Voigt, 2011, April 12 in Matthias-Claudius Gymnasium in Hamburg-Wandsbek. Time: 42.14s. Ulrich Voigt, 2011, July 10 in RenMin DaXue, Beijing at the end of a lecture "From Matteo Ricci to modern Memory Sport". Time: 41.14s. Ulrich Voigt, 2011, Sep. 24 in Rome at the Speed Memory Championships. Time: 39.42s. Ulrich Voigt, 2013, October 6 in Lisboa at the Speed Memory World Championships. Time: 38.86s. Fabian Saal, 2015, May 23, in Wuerzburg, Germany, at the Sueddeutsche Gedaechtnismeisterschaft. Time: 35.88 seconds Online: The "best 20" for these disciplines you can find on www.pi-sport.eu. You can register on this page and get a ranking. On this website you find more detailed information in several languages.